Merge remote-tracking branch 'origin/main' into feature/error-request-logging

# Conflicts:
#	src-tauri/src/proxy/handlers.rs
#	src-tauri/src/proxy/mod.rs
#	src-tauri/src/proxy/provider_router.rs
#	src-tauri/src/services/proxy.rs
#	src/components/providers/ProviderActions.tsx

src-tauri/src/commands/failover.rs

@@ -0,0 +1,84 @@
+//! 故障转移队列命令
+//!
+//! 管理代理模式下的故障转移队列
+
+use crate::database::FailoverQueueItem;
+use crate::provider::Provider;
+use crate::store::AppState;
+
+/// 获取故障转移队列
+#[tauri::command]
+pub async fn get_failover_queue(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+) -> Result<Vec<FailoverQueueItem>, String> {
+    state
+        .db
+        .get_failover_queue(&app_type)
+        .map_err(|e| e.to_string())
+}
+
+/// 获取可添加到故障转移队列的供应商（不在队列中的）
+#[tauri::command]
+pub async fn get_available_providers_for_failover(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+) -> Result<Vec<Provider>, String> {
+    state
+        .db
+        .get_available_providers_for_failover(&app_type)
+        .map_err(|e| e.to_string())
+}
+
+/// 添加供应商到故障转移队列
+#[tauri::command]
+pub async fn add_to_failover_queue(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+    provider_id: String,
+) -> Result<(), String> {
+    state
+        .db
+        .add_to_failover_queue(&app_type, &provider_id)
+        .map_err(|e| e.to_string())
+}
+
+/// 从故障转移队列移除供应商
+#[tauri::command]
+pub async fn remove_from_failover_queue(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+    provider_id: String,
+) -> Result<(), String> {
+    state
+        .db
+        .remove_from_failover_queue(&app_type, &provider_id)
+        .map_err(|e| e.to_string())
+}
+
+/// 重新排序故障转移队列
+#[tauri::command]
+pub async fn reorder_failover_queue(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+    provider_ids: Vec<String>,
+) -> Result<(), String> {
+    state
+        .db
+        .reorder_failover_queue(&app_type, &provider_ids)
+        .map_err(|e| e.to_string())
+}
+
+/// 设置故障转移队列项的启用状态
+#[tauri::command]
+pub async fn set_failover_item_enabled(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+    provider_id: String,
+    enabled: bool,
+) -> Result<(), String> {
+    state
+        .db
+        .set_failover_item_enabled(&app_type, &provider_id, enabled)
+        .map_err(|e| e.to_string())
+}

src-tauri/src/commands/mod.rs

@@ -3,6 +3,7 @@
 mod config;
 mod deeplink;
 mod env;
+mod failover;
 mod import_export;
 mod mcp;
 mod misc;
@@ -18,6 +19,7 @@ mod usage;
 pub use config::*;
 pub use deeplink::*;
 pub use env::*;
+pub use failover::*;
 pub use import_export::*;
 pub use mcp::*;
 pub use misc::*;

src-tauri/src/commands/provider.rs

@@ -86,19 +86,6 @@ pub fn switch_provider(
         .map_err(|e| e.to_string())
 }
 
-/// 设置代理目标供应商
-#[tauri::command]
-pub fn set_proxy_target_provider(
-    state: State<'_, AppState>,
-    app: String,
-    id: String,
-) -> Result<bool, String> {
-    let app_type = AppType::from_str(&app).map_err(|e| e.to_string())?;
-    ProviderService::set_proxy_target(state.inner(), app_type, &id)
-        .map(|_| true)
-        .map_err(|e| e.to_string())
-}
-
 fn import_default_config_internal(state: &AppState, app_type: AppType) -> Result<bool, AppError> {
     ProviderService::import_default_config(state, app_type)
 }

src-tauri/src/commands/proxy.rs

@@ -2,7 +2,6 @@
 //!
 //! 提供前端调用的 API 接口
 
-use crate::provider::Provider;
 use crate::proxy::types::*;
 use crate::proxy::{CircuitBreakerConfig, CircuitBreakerStats};
 use crate::store::AppState;
@@ -69,47 +68,6 @@ pub async fn switch_proxy_provider(
 
 // ==================== 故障转移相关命令 ====================
 
-/// 获取代理目标列表
-#[tauri::command]
-pub async fn get_proxy_targets(
-    state: tauri::State<'_, AppState>,
-    app_type: String,
-) -> Result<Vec<Provider>, String> {
-    let db = &state.db;
-    db.get_proxy_targets(&app_type)
-        .await
-        .map_err(|e| e.to_string())
-        .map(|providers| providers.into_values().collect())
-}
-
-/// 设置代理目标
-#[tauri::command]
-pub async fn set_proxy_target(
-    state: tauri::State<'_, AppState>,
-    provider_id: String,
-    app_type: String,
-    enabled: bool,
-) -> Result<(), String> {
-    let db = &state.db;
-
-    // 设置代理目标状态
-    db.set_proxy_target(&provider_id, &app_type, enabled)
-        .await
-        .map_err(|e| e.to_string())?;
-
-    // 如果是禁用代理目标，重置健康状态
-    if !enabled {
-        log::info!(
-            "Resetting health status for provider {provider_id} (app: {app_type}) after disabling proxy target"
-        );
-        if let Err(e) = db.reset_provider_health(&provider_id, &app_type).await {
-            log::warn!("Failed to reset provider health: {e}");
-        }
-    }
-
-    Ok(())
-}
-
 /// 获取供应商健康状态
 #[tauri::command]
 pub async fn get_provider_health(
@@ -130,15 +88,17 @@ pub async fn reset_circuit_breaker(
     provider_id: String,
     app_type: String,
 ) -> Result<(), String> {
-    // 重置数据库健康状态
+    // 1. 重置数据库健康状态
     let db = &state.db;
     db.update_provider_health(&provider_id, &app_type, true, None)
         .await
         .map_err(|e| e.to_string())?;
 
-    // 注意：熔断器状态在内存中，重启代理服务器后会重置
-    // 如果代理服务器正在运行，需要通知它重置熔断器
-    // 目前先通过数据库重置健康状态，熔断器会在下次超时后自动尝试半开
+    // 2. 如果代理正在运行，重置内存中的熔断器状态
+    state
+        .proxy_service
+        .reset_provider_circuit_breaker(&provider_id, &app_type)
+        .await?;
 
     Ok(())
 }
@@ -161,9 +121,19 @@ pub async fn update_circuit_breaker_config(
     config: CircuitBreakerConfig,
 ) -> Result<(), String> {
     let db = &state.db;
+
+    // 1. 更新数据库配置
     db.update_circuit_breaker_config(&config)
         .await
-        .map_err(|e| e.to_string())
+        .map_err(|e| e.to_string())?;
+
+    // 2. 如果代理正在运行，热更新内存中的熔断器配置
+    state
+        .proxy_service
+        .update_circuit_breaker_configs(config)
+        .await?;
+
+    Ok(())
 }
 
 /// 获取熔断器统计信息（仅当代理服务器运行时）

src-tauri/src/commands/stream_check.rs

@@ -6,6 +6,7 @@ use crate::services::stream_check::{
     HealthStatus, StreamCheckConfig, StreamCheckResult, StreamCheckService,
 };
 use crate::store::AppState;
+use std::collections::HashSet;
 use tauri::State;
 
 /// 流式健康检查（单个供应商）
@@ -44,10 +45,28 @@ pub async fn stream_check_all_providers(
     let providers = state.db.get_all_providers(app_type.as_str())?;
 
     let mut results = Vec::new();
+    let allowed_ids: Option<HashSet<String>> = if proxy_targets_only {
+        let mut ids = HashSet::new();
+        if let Ok(Some(current_id)) = state.db.get_current_provider(app_type.as_str()) {
+            ids.insert(current_id);
+        }
+        if let Ok(queue) = state.db.get_failover_queue(app_type.as_str()) {
+            for item in queue {
+                if item.enabled {
+                    ids.insert(item.provider_id);
+                }
+            }
+        }
+        Some(ids)
+    } else {
+        None
+    };
 
     for (id, provider) in providers {
-        if proxy_targets_only && !provider.is_proxy_target.unwrap_or(false) {
-            continue;
+        if let Some(ids) = &allowed_ids {
+            if !ids.contains(&id) {
+                continue;
+            }
         }
 
         let result = StreamCheckService::check_with_retry(&app_type, &provider, &config)

src-tauri/src/database/dao/failover.rs

@@ -0,0 +1,248 @@
+//! 故障转移队列 DAO
+//!
+//! 管理代理模式下的故障转移队列
+
+use crate::database::{lock_conn, Database};
+use crate::error::AppError;
+use crate::provider::Provider;
+use serde::{Deserialize, Serialize};
+use std::time::{SystemTime, UNIX_EPOCH};
+
+/// 故障转移队列条目
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct FailoverQueueItem {
+    pub provider_id: String,
+    pub provider_name: String,
+    pub queue_order: i32,
+    pub enabled: bool,
+    pub created_at: i64,
+}
+
+impl Database {
+    /// 获取故障转移队列（按 queue_order 排序）
+    pub fn get_failover_queue(&self, app_type: &str) -> Result<Vec<FailoverQueueItem>, AppError> {
+        let conn = lock_conn!(self.conn);
+
+        let mut stmt = conn
+            .prepare(
+                "SELECT fq.provider_id, p.name, fq.queue_order, fq.enabled, fq.created_at
+                 FROM failover_queue fq
+                 JOIN providers p ON fq.provider_id = p.id AND fq.app_type = p.app_type
+                 WHERE fq.app_type = ?1
+                 ORDER BY fq.queue_order ASC",
+            )
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        let items = stmt
+            .query_map([app_type], |row| {
+                Ok(FailoverQueueItem {
+                    provider_id: row.get(0)?,
+                    provider_name: row.get(1)?,
+                    queue_order: row.get(2)?,
+                    enabled: row.get(3)?,
+                    created_at: row.get(4)?,
+                })
+            })
+            .map_err(|e| AppError::Database(e.to_string()))?
+            .collect::<Result<Vec<_>, _>>()
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        Ok(items)
+    }
+
+    /// 获取故障转移队列中的供应商（完整 Provider 信息，按顺序）
+    pub fn get_failover_providers(&self, app_type: &str) -> Result<Vec<Provider>, AppError> {
+        let queue = self.get_failover_queue(app_type)?;
+        let all_providers = self.get_all_providers(app_type)?;
+
+        let mut result = Vec::new();
+        for item in queue {
+            if item.enabled {
+                if let Some(provider) = all_providers.get(&item.provider_id) {
+                    result.push(provider.clone());
+                }
+            }
+        }
+
+        Ok(result)
+    }
+
+    /// 添加供应商到故障转移队列末尾
+    pub fn add_to_failover_queue(
+        &self,
+        app_type: &str,
+        provider_id: &str,
+    ) -> Result<(), AppError> {
+        let conn = lock_conn!(self.conn);
+
+        // 获取当前最大 queue_order
+        let max_order: i32 = conn
+            .query_row(
+                "SELECT COALESCE(MAX(queue_order), 0) FROM failover_queue WHERE app_type = ?1",
+                [app_type],
+                |row| row.get(0),
+            )
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        let now = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap_or_default()
+            .as_secs() as i64;
+
+        conn.execute(
+            "INSERT OR IGNORE INTO failover_queue (app_type, provider_id, queue_order, enabled, created_at)
+             VALUES (?1, ?2, ?3, 1, ?4)",
+            rusqlite::params![app_type, provider_id, max_order + 1, now],
+        )
+        .map_err(|e| AppError::Database(e.to_string()))?;
+
+        Ok(())
+    }
+
+    /// 从故障转移队列中移除供应商
+    pub fn remove_from_failover_queue(
+        &self,
+        app_type: &str,
+        provider_id: &str,
+    ) -> Result<(), AppError> {
+        let conn = lock_conn!(self.conn);
+
+        // 获取被删除项的 queue_order
+        let removed_order: Option<i32> = conn
+            .query_row(
+                "SELECT queue_order FROM failover_queue WHERE app_type = ?1 AND provider_id = ?2",
+                [app_type, provider_id],
+                |row| row.get(0),
+            )
+            .ok();
+
+        // 删除该项
+        conn.execute(
+            "DELETE FROM failover_queue WHERE app_type = ?1 AND provider_id = ?2",
+            [app_type, provider_id],
+        )
+        .map_err(|e| AppError::Database(e.to_string()))?;
+
+        // 重新排序后面的项（填补空隙）
+        if let Some(order) = removed_order {
+            conn.execute(
+                "UPDATE failover_queue
+                 SET queue_order = queue_order - 1
+                 WHERE app_type = ?1 AND queue_order > ?2",
+                rusqlite::params![app_type, order],
+            )
+            .map_err(|e| AppError::Database(e.to_string()))?;
+        }
+
+        Ok(())
+    }
+
+    /// 重新排序故障转移队列
+    /// provider_ids: 按新顺序排列的 provider_id 列表
+    pub fn reorder_failover_queue(
+        &self,
+        app_type: &str,
+        provider_ids: &[String],
+    ) -> Result<(), AppError> {
+        let conn = lock_conn!(self.conn);
+
+        // 使用事务确保原子性
+        conn.execute("BEGIN TRANSACTION", [])
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        let result = (|| {
+            for (index, provider_id) in provider_ids.iter().enumerate() {
+                conn.execute(
+                    "UPDATE failover_queue
+                     SET queue_order = ?3
+                     WHERE app_type = ?1 AND provider_id = ?2",
+                    rusqlite::params![app_type, provider_id, (index + 1) as i32],
+                )
+                .map_err(|e| AppError::Database(e.to_string()))?;
+            }
+            Ok(())
+        })();
+
+        match result {
+            Ok(_) => {
+                conn.execute("COMMIT", [])
+                    .map_err(|e| AppError::Database(e.to_string()))?;
+                Ok(())
+            }
+            Err(e) => {
+                conn.execute("ROLLBACK", []).ok();
+                Err(e)
+            }
+        }
+    }
+
+    /// 设置故障转移队列中供应商的启用状态
+    pub fn set_failover_item_enabled(
+        &self,
+        app_type: &str,
+        provider_id: &str,
+        enabled: bool,
+    ) -> Result<(), AppError> {
+        let conn = lock_conn!(self.conn);
+
+        conn.execute(
+            "UPDATE failover_queue SET enabled = ?3 WHERE app_type = ?1 AND provider_id = ?2",
+            rusqlite::params![app_type, provider_id, enabled],
+        )
+        .map_err(|e| AppError::Database(e.to_string()))?;
+
+        Ok(())
+    }
+
+    /// 清空故障转移队列
+    pub fn clear_failover_queue(&self, app_type: &str) -> Result<(), AppError> {
+        let conn = lock_conn!(self.conn);
+
+        conn.execute(
+            "DELETE FROM failover_queue WHERE app_type = ?1",
+            [app_type],
+        )
+        .map_err(|e| AppError::Database(e.to_string()))?;
+
+        Ok(())
+    }
+
+    /// 检查供应商是否在故障转移队列中
+    pub fn is_in_failover_queue(
+        &self,
+        app_type: &str,
+        provider_id: &str,
+    ) -> Result<bool, AppError> {
+        let conn = lock_conn!(self.conn);
+
+        let count: i32 = conn
+            .query_row(
+                "SELECT COUNT(*) FROM failover_queue WHERE app_type = ?1 AND provider_id = ?2",
+                [app_type, provider_id],
+                |row| row.get(0),
+            )
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        Ok(count > 0)
+    }
+
+    /// 获取可添加到故障转移队列的供应商（不在队列中的）
+    pub fn get_available_providers_for_failover(
+        &self,
+        app_type: &str,
+    ) -> Result<Vec<Provider>, AppError> {
+        let all_providers = self.get_all_providers(app_type)?;
+        let queue = self.get_failover_queue(app_type)?;
+
+        let queue_ids: std::collections::HashSet<_> =
+            queue.iter().map(|item| &item.provider_id).collect();
+
+        let available: Vec<Provider> = all_providers
+            .into_values()
+            .filter(|p| !queue_ids.contains(&p.id))
+            .collect();
+
+        Ok(available)
+    }
+}

src-tauri/src/database/dao/mod.rs

@@ -2,6 +2,7 @@
 //!
 //! Database access operations for each domain
 
+pub mod failover;
 pub mod mcp;
 pub mod prompts;
 pub mod providers;
@@ -11,3 +12,5 @@ pub mod skills;
 pub mod stream_check;
 
 // 所有 DAO 方法都通过 Database impl 提供，无需单独导出
+// 导出 FailoverQueueItem 供外部使用
+pub use failover::FailoverQueueItem;

src-tauri/src/database/dao/providers.rs

@@ -17,7 +17,7 @@ impl Database {
     ) -> Result<IndexMap<String, Provider>, AppError> {
         let conn = lock_conn!(self.conn);
         let mut stmt = conn.prepare(
-            "SELECT id, name, settings_config, website_url, category, created_at, sort_index, notes, icon, icon_color, meta, is_proxy_target
+            "SELECT id, name, settings_config, website_url, category, created_at, sort_index, notes, icon, icon_color, meta
              FROM providers WHERE app_type = ?1
              ORDER BY COALESCE(sort_index, 999999), created_at ASC, id ASC"
         ).map_err(|e| AppError::Database(e.to_string()))?;
@@ -35,7 +35,6 @@ impl Database {
                 let icon: Option<String> = row.get(8)?;
                 let icon_color: Option<String> = row.get(9)?;
                 let meta_str: String = row.get(10)?;
-                let is_proxy_target: bool = row.get(11)?;
 
                 let settings_config =
                     serde_json::from_str(&settings_config_str).unwrap_or(serde_json::Value::Null);
@@ -55,7 +54,6 @@ impl Database {
                         meta: Some(meta),
                         icon,
                         icon_color,
-                        is_proxy_target: Some(is_proxy_target),
                     },
                 ))
             })
@@ -131,7 +129,7 @@ impl Database {
     ) -> Result<Option<Provider>, AppError> {
         let conn = lock_conn!(self.conn);
         let result = conn.query_row(
-            "SELECT name, settings_config, website_url, category, created_at, sort_index, notes, icon, icon_color, meta, is_proxy_target
+            "SELECT name, settings_config, website_url, category, created_at, sort_index, notes, icon, icon_color, meta
              FROM providers WHERE id = ?1 AND app_type = ?2",
             params![id, app_type],
             |row| {
@@ -145,7 +143,6 @@ impl Database {
                 let icon: Option<String> = row.get(7)?;
                 let icon_color: Option<String> = row.get(8)?;
                 let meta_str: String = row.get(9)?;
-                let is_proxy_target: bool = row.get(10)?;
 
                 let settings_config = serde_json::from_str(&settings_config_str).unwrap_or(serde_json::Value::Null);
                 let meta: ProviderMeta = serde_json::from_str(&meta_str).unwrap_or_default();
@@ -162,7 +159,6 @@ impl Database {
                     meta: Some(meta),
                     icon,
                     icon_color,
-                    is_proxy_target: Some(is_proxy_target),
                 })
             },
         );
@@ -174,26 +170,6 @@ impl Database {
         }
     }
 
-    /// 获取代理目标供应商 ID
-    pub fn get_proxy_target_provider(&self, app_type: &str) -> Result<Option<String>, AppError> {
-        let conn = lock_conn!(self.conn);
-        let mut stmt = conn
-            .prepare("SELECT id FROM providers WHERE app_type = ?1 AND is_proxy_target = 1 LIMIT 1")
-            .map_err(|e| AppError::Database(e.to_string()))?;
-
-        let mut rows = stmt
-            .query(params![app_type])
-            .map_err(|e| AppError::Database(e.to_string()))?;
-
-        if let Some(row) = rows.next().map_err(|e| AppError::Database(e.to_string()))? {
-            Ok(Some(
-                row.get(0).map_err(|e| AppError::Database(e.to_string()))?,
-            ))
-        } else {
-            Ok(None)
-        }
-    }
-
     /// 保存供应商（新增或更新）
     ///
     /// 注意：更新模式下不同步 endpoints，因为编辑模式下端点通过单独的 API 管理
@@ -208,17 +184,17 @@ impl Database {
         let mut meta_clone = provider.meta.clone().unwrap_or_default();
         let endpoints = std::mem::take(&mut meta_clone.custom_endpoints);
 
-        // 检查是否存在（用于判断新增/更新，以及保留 is_current 和 is_proxy_target）
-        let existing: Option<(bool, bool)> = tx
+        // 检查是否存在（用于判断新增/更新，以及保留 is_current）
+        let existing: Option<bool> = tx
             .query_row(
-                "SELECT is_current, is_proxy_target FROM providers WHERE id = ?1 AND app_type = ?2",
+                "SELECT is_current FROM providers WHERE id = ?1 AND app_type = ?2",
                 params![provider.id, app_type],
-                |row| Ok((row.get(0)?, row.get(1)?)),
+                |row| row.get(0),
             )
             .ok();
 
         let is_update = existing.is_some();
-        let (is_current, is_proxy_target) = existing.unwrap_or((false, false));
+        let is_current = existing.unwrap_or(false);
 
         if is_update {
             // 更新模式：使用 UPDATE 避免触发 ON DELETE CASCADE
@@ -234,9 +210,8 @@ impl Database {
                     icon = ?8,
                     icon_color = ?9,
                     meta = ?10,
-                    is_current = ?11,
-                    is_proxy_target = ?12
-                WHERE id = ?13 AND app_type = ?14",
+                    is_current = ?11
+                WHERE id = ?12 AND app_type = ?13",
                 params![
                     provider.name,
                     serde_json::to_string(&provider.settings_config).unwrap(),
@@ -249,7 +224,6 @@ impl Database {
                     provider.icon_color,
                     serde_json::to_string(&meta_clone).unwrap(),
                     is_current,
-                    is_proxy_target,
                     provider.id,
                     app_type,
                 ],
@@ -260,8 +234,8 @@ impl Database {
             tx.execute(
                 "INSERT INTO providers (
                     id, app_type, name, settings_config, website_url, category,
-                    created_at, sort_index, notes, icon, icon_color, meta, is_current, is_proxy_target
-                ) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11, ?12, ?13, ?14)",
+                    created_at, sort_index, notes, icon, icon_color, meta, is_current
+                ) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11, ?12, ?13)",
                 params![
                     provider.id,
                     app_type,
@@ -276,7 +250,6 @@ impl Database {
                     provider.icon_color,
                     serde_json::to_string(&meta_clone).unwrap(),
                     is_current,
-                    is_proxy_target,
                 ],
             )
             .map_err(|e| AppError::Database(e.to_string()))?;
@@ -332,157 +305,6 @@ impl Database {
         Ok(())
     }
 
-    /// 设置代理目标供应商
-    pub fn set_proxy_target_provider(&self, app_type: &str, id: &str) -> Result<(), AppError> {
-        let mut conn = lock_conn!(self.conn);
-        let tx = conn
-            .transaction()
-            .map_err(|e| AppError::Database(e.to_string()))?;
-
-        // 重置所有为 0
-        tx.execute(
-            "UPDATE providers SET is_proxy_target = 0 WHERE app_type = ?1",
-            params![app_type],
-        )
-        .map_err(|e| AppError::Database(e.to_string()))?;
-
-        // 设置新的代理目标供应商
-        tx.execute(
-            "UPDATE providers SET is_proxy_target = 1 WHERE id = ?1 AND app_type = ?2",
-            params![id, app_type],
-        )
-        .map_err(|e| AppError::Database(e.to_string()))?;
-
-        tx.commit().map_err(|e| AppError::Database(e.to_string()))?;
-        Ok(())
-    }
-
-    /// 设置单个供应商的代理目标状态（支持多个代理目标）
-    pub async fn set_proxy_target(
-        &self,
-        provider_id: &str,
-        app_type: &str,
-        enabled: bool,
-    ) -> Result<(), AppError> {
-        let conn = lock_conn!(self.conn);
-        conn.execute(
-            "UPDATE providers SET is_proxy_target = ?1
-             WHERE id = ?2 AND app_type = ?3",
-            params![if enabled { 1 } else { 0 }, provider_id, app_type],
-        )
-        .map_err(|e| AppError::Database(e.to_string()))?;
-        Ok(())
-    }
-
-    /// 获取指定应用类型的所有代理目标供应商（按 sort_index 排序）
-    pub async fn get_proxy_targets(
-        &self,
-        app_type: &str,
-    ) -> Result<IndexMap<String, Provider>, AppError> {
-        let conn = lock_conn!(self.conn);
-        let mut stmt = conn.prepare(
-            "SELECT id, name, settings_config, website_url, category, created_at, sort_index, notes, icon, icon_color, meta, is_proxy_target
-             FROM providers WHERE app_type = ?1 AND is_proxy_target = 1
-             ORDER BY COALESCE(sort_index, 999999), created_at ASC, id ASC"
-        ).map_err(|e| AppError::Database(e.to_string()))?;
-
-        let provider_iter = stmt
-            .query_map(params![app_type], |row| {
-                let id: String = row.get(0)?;
-                let name: String = row.get(1)?;
-                let settings_config_str: String = row.get(2)?;
-                let website_url: Option<String> = row.get(3)?;
-                let category: Option<String> = row.get(4)?;
-                let created_at: Option<i64> = row.get(5)?;
-                let sort_index: Option<usize> = row.get(6)?;
-                let notes: Option<String> = row.get(7)?;
-                let icon: Option<String> = row.get(8)?;
-                let icon_color: Option<String> = row.get(9)?;
-                let meta_str: String = row.get(10)?;
-                let is_proxy_target: bool = row.get(11)?;
-
-                let settings_config =
-                    serde_json::from_str(&settings_config_str).unwrap_or(serde_json::Value::Null);
-                let meta: ProviderMeta = serde_json::from_str(&meta_str).unwrap_or_default();
-
-                Ok((
-                    id,
-                    Provider {
-                        id: "".to_string(),
-                        name,
-                        settings_config,
-                        website_url,
-                        category,
-                        created_at,
-                        sort_index,
-                        notes,
-                        meta: Some(meta),
-                        icon,
-                        icon_color,
-                        is_proxy_target: Some(is_proxy_target),
-                    },
-                ))
-            })
-            .map_err(|e| AppError::Database(e.to_string()))?;
-
-        let mut providers = IndexMap::new();
-        for provider_res in provider_iter {
-            let (id, mut provider) = provider_res.map_err(|e| AppError::Database(e.to_string()))?;
-            provider.id = id.clone();
-
-            // 加载 endpoints
-            let mut stmt_endpoints = conn.prepare(
-                "SELECT url, added_at FROM provider_endpoints WHERE provider_id = ?1 AND app_type = ?2 ORDER BY added_at ASC, url ASC"
-            ).map_err(|e| AppError::Database(e.to_string()))?;
-
-            let endpoints_iter = stmt_endpoints
-                .query_map(params![id, app_type], |row| {
-                    let url: String = row.get(0)?;
-                    let added_at: Option<i64> = row.get(1)?;
-                    Ok((
-                        url,
-                        crate::settings::CustomEndpoint {
-                            url: "".to_string(),
-                            added_at: added_at.unwrap_or(0),
-                            last_used: None,
-                        },
-                    ))
-                })
-                .map_err(|e| AppError::Database(e.to_string()))?;
-
-            let mut custom_endpoints = HashMap::new();
-            for ep_res in endpoints_iter {
-                let (url, mut ep) = ep_res.map_err(|e| AppError::Database(e.to_string()))?;
-                ep.url = url.clone();
-                custom_endpoints.insert(url, ep);
-            }
-
-            if let Some(meta) = &mut provider.meta {
-                meta.custom_endpoints = custom_endpoints;
-            }
-
-            providers.insert(id, provider);
-        }
-
-        Ok(providers)
-    }
-
-    /// 获取所有活跃的代理目标
-    pub fn get_all_proxy_targets(&self) -> Result<Vec<(String, String, String)>, AppError> {
-        let conn = lock_conn!(self.conn);
-        let mut stmt = conn
-            .prepare("SELECT app_type, name, id FROM providers WHERE is_proxy_target = 1")
-            .map_err(|e| AppError::Database(e.to_string()))?;
-
-        let targets = stmt
-            .query_map([], |row| Ok((row.get(0)?, row.get(1)?, row.get(2)?)))
-            .map_err(|e| AppError::Database(e.to_string()))?
-            .collect::<Result<Vec<_>, _>>()
-            .map_err(|e| AppError::Database(e.to_string()))?;
-
-        Ok(targets)
-    }
-
     /// 更新供应商的 settings_config（仅更新配置，不改变其他字段）
     pub fn update_provider_settings_config(
         &self,

src-tauri/src/database/dao/proxy.rs

@@ -129,12 +129,31 @@ impl Database {
     }
 
     /// 更新Provider健康状态
+    ///
+    /// 使用默认阈值（5）判断是否健康，建议使用 `update_provider_health_with_threshold` 传入配置的阈值
     pub async fn update_provider_health(
         &self,
         provider_id: &str,
         app_type: &str,
         success: bool,
         error_msg: Option<String>,
+    ) -> Result<(), AppError> {
+        // 默认阈值与 CircuitBreakerConfig::default() 保持一致
+        self.update_provider_health_with_threshold(provider_id, app_type, success, error_msg, 5)
+            .await
+    }
+
+    /// 更新Provider健康状态（带阈值参数）
+    ///
+    /// # Arguments
+    /// * `failure_threshold` - 连续失败多少次后标记为不健康
+    pub async fn update_provider_health_with_threshold(
+        &self,
+        provider_id: &str,
+        app_type: &str,
+        success: bool,
+        error_msg: Option<String>,
+        failure_threshold: u32,
     ) -> Result<(), AppError> {
         let conn = lock_conn!(self.conn);
 
@@ -142,7 +161,7 @@ impl Database {
 
         // 先查询当前状态
         let current = conn.query_row(
-            "SELECT consecutive_failures FROM provider_health 
+            "SELECT consecutive_failures FROM provider_health
              WHERE provider_id = ?1 AND app_type = ?2",
             rusqlite::params![provider_id, app_type],
             |row| Ok(row.get::<_, i64>(0)? as u32),
@@ -154,7 +173,8 @@ impl Database {
         } else {
             // 失败：增加失败计数
             let failures = current.unwrap_or(0) + 1;
-            let healthy = if failures >= 3 { 0 } else { 1 };
+            // 使用传入的阈值而非硬编码
+            let healthy = if failures >= failure_threshold { 0 } else { 1 };
             (healthy, failures)
         };
 
@@ -169,10 +189,10 @@ impl Database {
             "INSERT OR REPLACE INTO provider_health
              (provider_id, app_type, is_healthy, consecutive_failures,
               last_success_at, last_failure_at, last_error, updated_at)
-             VALUES (?1, ?2, ?3, ?4, 
-                     COALESCE(?5, (SELECT last_success_at FROM provider_health 
+             VALUES (?1, ?2, ?3, ?4,
+                     COALESCE(?5, (SELECT last_success_at FROM provider_health
                                    WHERE provider_id = ?1 AND app_type = ?2)),
-                     COALESCE(?6, (SELECT last_failure_at FROM provider_health 
+                     COALESCE(?6, (SELECT last_failure_at FROM provider_health
                                    WHERE provider_id = ?1 AND app_type = ?2)),
                      ?7, ?8)",
             rusqlite::params![
@@ -210,6 +230,17 @@ impl Database {
         Ok(())
     }
 
+    /// 清空所有Provider健康状态（代理停止时调用）
+    pub async fn clear_all_provider_health(&self) -> Result<(), AppError> {
+        let conn = lock_conn!(self.conn);
+
+        conn.execute("DELETE FROM provider_health", [])
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        log::debug!("Cleared all provider health records");
+        Ok(())
+    }
+
     // ==================== Circuit Breaker Config ====================
 
     /// 获取熔断器配置

src-tauri/src/database/mod.rs

@@ -31,6 +31,9 @@ mod schema;
 #[cfg(test)]
 mod tests;
 
+// DAO 类型导出供外部使用
+pub use dao::FailoverQueueItem;
+
 use crate::config::get_app_config_dir;
 use crate::error::AppError;
 use rusqlite::Connection;

src-tauri/src/database/schema.rs

@@ -31,19 +31,12 @@ impl Database {
                 icon_color TEXT,
                 meta TEXT NOT NULL DEFAULT '{}',
                 is_current BOOLEAN NOT NULL DEFAULT 0,
-                is_proxy_target BOOLEAN NOT NULL DEFAULT 0,
                 PRIMARY KEY (id, app_type)
             )",
             [],
         )
         .map_err(|e| AppError::Database(e.to_string()))?;
 
-        // 尝试添加 is_proxy_target 列（如果表已存在但缺少该列）
-        let _ = conn.execute(
-            "ALTER TABLE providers ADD COLUMN is_proxy_target BOOLEAN NOT NULL DEFAULT 0",
-            [],
-        );
-
         // 2. Provider Endpoints 表
         conn.execute(
             "CREATE TABLE IF NOT EXISTS provider_endpoints (
@@ -319,6 +312,30 @@ impl Database {
             [],
         );
 
+        // 14. Failover Queue 表 (故障转移队列)
+        conn.execute(
+            "CREATE TABLE IF NOT EXISTS failover_queue (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                app_type TEXT NOT NULL,
+                provider_id TEXT NOT NULL,
+                queue_order INTEGER NOT NULL,
+                enabled INTEGER NOT NULL DEFAULT 1,
+                created_at INTEGER NOT NULL,
+                UNIQUE (app_type, provider_id),
+                FOREIGN KEY (provider_id, app_type) REFERENCES providers(id, app_type) ON DELETE CASCADE
+            )",
+            [],
+        )
+        .map_err(|e| AppError::Database(e.to_string()))?;
+
+        // 为故障转移队列创建索引
+        conn.execute(
+            "CREATE INDEX IF NOT EXISTS idx_failover_queue_order
+             ON failover_queue(app_type, queue_order)",
+            [],
+        )
+        .map_err(|e| AppError::Database(e.to_string()))?;
+
         Ok(())
     }
 

src-tauri/src/database/tests.rs

@@ -245,7 +245,6 @@ fn dry_run_validates_schema_compatibility() {
             meta: None,
             icon: None,
             icon_color: None,
-            is_proxy_target: Some(false),
         },
     );
 

src-tauri/src/deeplink/mod.rs

@@ -113,4 +113,27 @@ pub struct DeepLinkImportRequest {
     /// Remote config URL
     #[serde(skip_serializing_if = "Option::is_none")]
     pub config_url: Option<String>,
+
+    // ============ Usage script fields (v3.9+) ============
+    /// Whether to enable usage query (default: true if usage_script is provided)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub usage_enabled: Option<bool>,
+    /// Base64 encoded usage query script code
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub usage_script: Option<String>,
+    /// Usage query API key (if different from provider API key)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub usage_api_key: Option<String>,
+    /// Usage query base URL (if different from provider endpoint)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub usage_base_url: Option<String>,
+    /// Usage query access token (for NewAPI template)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub usage_access_token: Option<String>,
+    /// Usage query user ID (for NewAPI template)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub usage_user_id: Option<String>,
+    /// Auto query interval in minutes (0 to disable)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub usage_auto_interval: Option<u64>,
 }

src-tauri/src/deeplink/parser.rs

@@ -122,6 +122,19 @@ fn parse_provider_deeplink(
     let config_url = params.get("configUrl").cloned();
     let enabled = params.get("enabled").and_then(|v| v.parse::<bool>().ok());
 
+    // Extract usage script fields (v3.9+)
+    let usage_enabled = params
+        .get("usageEnabled")
+        .and_then(|v| v.parse::<bool>().ok());
+    let usage_script = params.get("usageScript").cloned();
+    let usage_api_key = params.get("usageApiKey").cloned();
+    let usage_base_url = params.get("usageBaseUrl").cloned();
+    let usage_access_token = params.get("usageAccessToken").cloned();
+    let usage_user_id = params.get("usageUserId").cloned();
+    let usage_auto_interval = params
+        .get("usageAutoInterval")
+        .and_then(|v| v.parse::<u64>().ok());
+
     Ok(DeepLinkImportRequest {
         version,
         resource,
@@ -146,6 +159,13 @@ fn parse_provider_deeplink(
         config,
         config_format,
         config_url,
+        usage_enabled,
+        usage_script,
+        usage_api_key,
+        usage_base_url,
+        usage_access_token,
+        usage_user_id,
+        usage_auto_interval,
     })
 }
 
@@ -206,6 +226,13 @@ fn parse_prompt_deeplink(
         config: None,
         config_format: None,
         config_url: None,
+        usage_enabled: None,
+        usage_script: None,
+        usage_api_key: None,
+        usage_base_url: None,
+        usage_access_token: None,
+        usage_user_id: None,
+        usage_auto_interval: None,
     })
 }
 
@@ -261,6 +288,13 @@ fn parse_mcp_deeplink(
         directory: None,
         branch: None,
         config_url: None,
+        usage_enabled: None,
+        usage_script: None,
+        usage_api_key: None,
+        usage_base_url: None,
+        usage_access_token: None,
+        usage_user_id: None,
+        usage_auto_interval: None,
     })
 }
 
@@ -309,5 +343,12 @@ fn parse_skill_deeplink(
         config: None,
         config_format: None,
         config_url: None,
+        usage_enabled: None,
+        usage_script: None,
+        usage_api_key: None,
+        usage_base_url: None,
+        usage_access_token: None,
+        usage_user_id: None,
+        usage_auto_interval: None,
     })
 }

src-tauri/src/deeplink/provider.rs

@@ -5,7 +5,7 @@
 use super::utils::{decode_base64_param, infer_homepage_from_endpoint};
 use super::DeepLinkImportRequest;
 use crate::error::AppError;
-use crate::provider::Provider;
+use crate::provider::{Provider, ProviderMeta, UsageScript};
 use crate::services::ProviderService;
 use crate::store::AppState;
 use crate::AppType;
@@ -117,6 +117,9 @@ pub(crate) fn build_provider_from_request(
         AppType::Gemini => build_gemini_settings(request),
     };
 
+    // Build usage script configuration if provided
+    let meta = build_provider_meta(request)?;
+
     let provider = Provider {
         id: String::new(), // Will be generated by caller
         name: request.name.clone().unwrap_or_default(),
@@ -126,15 +129,65 @@ pub(crate) fn build_provider_from_request(
         created_at: None,
         sort_index: None,
         notes: request.notes.clone(),
-        meta: None,
+        meta,
         icon: request.icon.clone(),
         icon_color: None,
-        is_proxy_target: None,
     };
 
     Ok(provider)
 }
 
+/// Build provider meta with usage script configuration
+fn build_provider_meta(request: &DeepLinkImportRequest) -> Result<Option<ProviderMeta>, AppError> {
+    // Check if any usage script fields are provided
+    if request.usage_script.is_none()
+        && request.usage_enabled.is_none()
+        && request.usage_api_key.is_none()
+        && request.usage_base_url.is_none()
+        && request.usage_access_token.is_none()
+        && request.usage_user_id.is_none()
+        && request.usage_auto_interval.is_none()
+    {
+        return Ok(None);
+    }
+
+    // Decode usage script code if provided
+    let code = if let Some(script_b64) = &request.usage_script {
+        let decoded = decode_base64_param("usage_script", script_b64)?;
+        String::from_utf8(decoded)
+            .map_err(|e| AppError::InvalidInput(format!("Invalid UTF-8 in usage_script: {e}")))?
+    } else {
+        String::new()
+    };
+
+    // Determine enabled state: explicit param > has code > false
+    let enabled = request.usage_enabled.unwrap_or(!code.is_empty());
+
+    // Build UsageScript - use provider's API key and endpoint as defaults
+    let usage_script = UsageScript {
+        enabled,
+        language: "javascript".to_string(),
+        code,
+        timeout: Some(10),
+        api_key: request
+            .usage_api_key
+            .clone()
+            .or_else(|| request.api_key.clone()),
+        base_url: request
+            .usage_base_url
+            .clone()
+            .or_else(|| request.endpoint.clone()),
+        access_token: request.usage_access_token.clone(),
+        user_id: request.usage_user_id.clone(),
+        auto_query_interval: request.usage_auto_interval,
+    };
+
+    Ok(Some(ProviderMeta {
+        usage_script: Some(usage_script),
+        ..Default::default()
+    }))
+}
+
 /// Build Claude settings configuration
 fn build_claude_settings(request: &DeepLinkImportRequest) -> serde_json::Value {
     let mut env = serde_json::Map::new();

src-tauri/src/deeplink/tests.rs

@@ -145,6 +145,13 @@ fn test_build_gemini_provider_with_model() {
         content: None,
         description: None,
         enabled: None,
+        usage_enabled: None,
+        usage_script: None,
+        usage_api_key: None,
+        usage_base_url: None,
+        usage_access_token: None,
+        usage_user_id: None,
+        usage_auto_interval: None,
     };
 
     let provider = build_provider_from_request(&AppType::Gemini, &request).unwrap();
@@ -191,6 +198,13 @@ fn test_build_gemini_provider_without_model() {
         content: None,
         description: None,
         enabled: None,
+        usage_enabled: None,
+        usage_script: None,
+        usage_api_key: None,
+        usage_base_url: None,
+        usage_access_token: None,
+        usage_user_id: None,
+        usage_auto_interval: None,
     };
 
     let provider = build_provider_from_request(&AppType::Gemini, &request).unwrap();
@@ -232,6 +246,13 @@ fn test_parse_and_merge_config_claude() {
         content: None,
         description: None,
         enabled: None,
+        usage_enabled: None,
+        usage_script: None,
+        usage_api_key: None,
+        usage_base_url: None,
+        usage_access_token: None,
+        usage_user_id: None,
+        usage_auto_interval: None,
     };
 
     let merged = parse_and_merge_config(&request).unwrap();
@@ -275,6 +296,13 @@ fn test_parse_and_merge_config_url_override() {
         content: None,
         description: None,
         enabled: None,
+        usage_enabled: None,
+        usage_script: None,
+        usage_api_key: None,
+        usage_base_url: None,
+        usage_access_token: None,
+        usage_user_id: None,
+        usage_auto_interval: None,
     };
 
     let merged = parse_and_merge_config(&request).unwrap();

src-tauri/src/lib.rs

@@ -39,8 +39,8 @@ pub use mcp::{
 };
 pub use provider::{Provider, ProviderMeta};
 pub use services::{
-    ConfigService, EndpointLatency, McpService, PromptService, ProviderService, SkillService,
-    SpeedtestService,
+    ConfigService, EndpointLatency, McpService, PromptService, ProviderService, ProxyService,
+    SkillService, SpeedtestService,
 };
 pub use settings::{update_settings, AppSettings};
 pub use store::AppState;
@@ -332,6 +332,11 @@ pub fn run() {
 
             let app_state = AppState::new(db);
 
+            // 设置 AppHandle 用于代理故障转移时的 UI 更新
+            app_state
+                .proxy_service
+                .set_app_handle(app.handle().clone());
+
             // ============================================================
             // 按表独立判断的导入逻辑（各类数据独立检查，互不影响）
             // ============================================================
@@ -522,10 +527,33 @@ pub fn run() {
                 }
             }
 
-            // 自动启动代理服务器
+            // 异常退出恢复 + 自动启动代理服务器
             let app_handle = app.handle().clone();
             tauri::async_runtime::spawn(async move {
                 let state = app_handle.state::<AppState>();
+
+                // 1. 检测异常退出并恢复 Live 配置
+                match state.db.is_live_takeover_active().await {
+                    Ok(true) => {
+                        // 接管标志为 true 但代理未运行 → 上次异常退出
+                        if !state.proxy_service.is_running().await {
+                            log::warn!("检测到上次异常退出，正在恢复 Live 配置...");
+                            if let Err(e) = state.proxy_service.recover_from_crash().await {
+                                log::error!("恢复 Live 配置失败: {e}");
+                            } else {
+                                log::info!("Live 配置已从异常退出中恢复");
+                            }
+                        }
+                    }
+                    Ok(false) => {
+                        // 正常状态，无需恢复
+                    }
+                    Err(e) => {
+                        log::error!("检查接管状态失败: {e}");
+                    }
+                }
+
+                // 2. 自动启动代理服务器（如果配置为启用）
                 match state.db.get_proxy_config().await {
                     Ok(config) => {
                         if config.enabled {
@@ -553,7 +581,6 @@ pub fn run() {
             commands::update_provider,
             commands::delete_provider,
             commands::switch_provider,
-            commands::set_proxy_target_provider,
             commands::import_default_config,
             commands::get_claude_config_status,
             commands::get_config_status,
@@ -656,13 +683,18 @@ pub fn run() {
             commands::is_live_takeover_active,
             commands::switch_proxy_provider,
             // Proxy failover commands
-            commands::get_proxy_targets,
-            commands::set_proxy_target,
             commands::get_provider_health,
             commands::reset_circuit_breaker,
             commands::get_circuit_breaker_config,
             commands::update_circuit_breaker_config,
             commands::get_circuit_breaker_stats,
+            // Failover queue management
+            commands::get_failover_queue,
+            commands::get_available_providers_for_failover,
+            commands::add_to_failover_queue,
+            commands::remove_from_failover_queue,
+            commands::reorder_failover_queue,
+            commands::set_failover_item_enabled,
             // Usage statistics
             commands::get_usage_summary,
             commands::get_usage_trends,
@@ -697,6 +729,10 @@ pub fn run() {
             tauri::async_runtime::spawn(async move {
                 cleanup_before_exit(&app_handle).await;
                 log::info!("清理完成，退出应用");
+
+                // 短暂等待确保所有 I/O 操作（如数据库写入）刷新到磁盘
+                tokio::time::sleep(std::time::Duration::from_millis(100)).await;
+
                 // 使用 std::process::exit 避免再次触发 ExitRequested
                 std::process::exit(0);
             });

src-tauri/src/provider.rs

@@ -36,10 +36,6 @@ pub struct Provider {
     #[serde(skip_serializing_if = "Option::is_none")]
     #[serde(rename = "iconColor")]
     pub icon_color: Option<String>,
-    /// 是否为代理目标（数据库专用字段，不写入配置文件）
-    #[serde(skip_serializing_if = "Option::is_none")]
-    #[serde(rename = "isProxyTarget")]
-    pub is_proxy_target: Option<bool>,
 }
 
 impl Provider {
@@ -62,7 +58,6 @@ impl Provider {
             meta: None,
             icon: None,
             icon_color: None,
-            is_proxy_target: None,
         }
     }
 }

src-tauri/src/proxy/circuit_breaker.rs

@@ -72,8 +72,10 @@ pub struct CircuitBreaker {
     failed_requests: Arc<AtomicU32>,
     /// 上次打开时间
     last_opened_at: Arc<RwLock<Option<Instant>>>,
-    /// 配置
-    config: CircuitBreakerConfig,
+    /// 配置（支持热更新）
+    config: Arc<RwLock<CircuitBreakerConfig>>,
+    /// 半开状态已放行的请求数（用于限流）
+    half_open_requests: Arc<AtomicU32>,
 }
 
 impl CircuitBreaker {
@@ -86,20 +88,35 @@ impl CircuitBreaker {
             total_requests: Arc::new(AtomicU32::new(0)),
             failed_requests: Arc::new(AtomicU32::new(0)),
             last_opened_at: Arc::new(RwLock::new(None)),
-            config,
+            config: Arc::new(RwLock::new(config)),
+            half_open_requests: Arc::new(AtomicU32::new(0)),
         }
     }
 
-    /// 检查是否允许请求通过
-    pub async fn allow_request(&self) -> bool {
+    /// 更新熔断器配置（热更新，不重置状态）
+    pub async fn update_config(&self, new_config: CircuitBreakerConfig) {
+        *self.config.write().await = new_config;
+        log::debug!("Circuit breaker config updated");
+    }
+
+    /// 判断当前 Provider 是否“可被纳入候选链路”
+    ///
+    /// 这个方法不会占用 HalfOpen 探测名额，仅用于路由选择阶段的“可用性判断”：
+    /// - Closed / HalfOpen：可用（返回 true）
+    /// - Open：若超时到达则切到 HalfOpen 并返回 true，否则返回 false
+    ///
+    /// 注意：真正发起请求前仍需调用 `allow_request()` 来获取 HalfOpen 探测名额，
+    /// 并在请求结束后通过 `record_success()` / `record_failure()` 释放。
+    pub async fn is_available(&self) -> bool {
         let state = *self.state.read().await;
+        let config = self.config.read().await;
 
         match state {
-            CircuitState::Closed => true,
+            CircuitState::Closed | CircuitState::HalfOpen => true,
             CircuitState::Open => {
-                // 检查是否应该尝试半开
                 if let Some(opened_at) = *self.last_opened_at.read().await {
-                    if opened_at.elapsed().as_secs() >= self.config.timeout_seconds {
+                    if opened_at.elapsed().as_secs() >= config.timeout_seconds {
+                        drop(config); // 释放读锁再转换状态
                         log::info!(
                             "Circuit breaker transitioning from Open to HalfOpen (timeout reached)"
                         );
@@ -109,13 +126,62 @@ impl CircuitBreaker {
                 }
                 false
             }
-            CircuitState::HalfOpen => true,
+        }
+    }
+
+    /// 检查是否允许请求通过
+    pub async fn allow_request(&self) -> bool {
+        let state = *self.state.read().await;
+        let config = self.config.read().await;
+
+        match state {
+            CircuitState::Closed => true,
+            CircuitState::Open => {
+                // 检查是否应该尝试半开
+                if let Some(opened_at) = *self.last_opened_at.read().await {
+                    if opened_at.elapsed().as_secs() >= config.timeout_seconds {
+                        drop(config); // 释放读锁再转换状态
+                        log::info!(
+                            "Circuit breaker transitioning from Open to HalfOpen (timeout reached)"
+                        );
+                        self.transition_to_half_open().await;
+                        // 增加计数，确保 record_success/record_failure 减计数时不会下溢
+                        self.half_open_requests.fetch_add(1, Ordering::SeqCst);
+                        return true;
+                    }
+                }
+                false
+            }
+            CircuitState::HalfOpen => {
+                // 半开状态限流：只允许有限请求通过进行探测
+                // 默认最多允许 1 个请求（可在配置中扩展）
+                let max_half_open_requests = 1u32;
+                let current = self.half_open_requests.fetch_add(1, Ordering::SeqCst);
+
+                if current < max_half_open_requests {
+                    log::debug!(
+                        "Circuit breaker HalfOpen: allowing probe request ({}/{})",
+                        current + 1,
+                        max_half_open_requests
+                    );
+                    true
+                } else {
+                    // 超过限额，回退计数，拒绝请求
+                    self.half_open_requests.fetch_sub(1, Ordering::SeqCst);
+                    log::debug!(
+                        "Circuit breaker HalfOpen: rejecting request (limit reached: {})",
+                        max_half_open_requests
+                    );
+                    false
+                }
+            }
         }
     }
 
     /// 记录成功
     pub async fn record_success(&self) {
         let state = *self.state.read().await;
+        let config = self.config.read().await;
 
         // 重置失败计数
         self.consecutive_failures.store(0, Ordering::SeqCst);
@@ -123,14 +189,18 @@ impl CircuitBreaker {
 
         match state {
             CircuitState::HalfOpen => {
+                // 释放 in-flight 名额（探测请求结束）
+                self.half_open_requests.fetch_sub(1, Ordering::SeqCst);
+
                 let successes = self.consecutive_successes.fetch_add(1, Ordering::SeqCst) + 1;
                 log::debug!(
                     "Circuit breaker HalfOpen: {} consecutive successes (threshold: {})",
                     successes,
-                    self.config.success_threshold
+                    config.success_threshold
                 );
 
-                if successes >= self.config.success_threshold {
+                if successes >= config.success_threshold {
+                    drop(config); // 释放读锁再转换状态
                     log::info!("Circuit breaker transitioning from HalfOpen to Closed (success threshold reached)");
                     self.transition_to_closed().await;
                 }
@@ -145,6 +215,7 @@ impl CircuitBreaker {
     /// 记录失败
     pub async fn record_failure(&self) {
         let state = *self.state.read().await;
+        let config = self.config.read().await;
 
         // 更新计数器
         let failures = self.consecutive_failures.fetch_add(1, Ordering::SeqCst) + 1;
@@ -158,26 +229,38 @@ impl CircuitBreaker {
             "Circuit breaker {:?}: {} consecutive failures (threshold: {})",
             state,
             failures,
-            self.config.failure_threshold
+            config.failure_threshold
         );
 
         // 检查是否应该打开熔断器
         match state {
-            CircuitState::Closed | CircuitState::HalfOpen => {
+            CircuitState::HalfOpen => {
+                // 释放 in-flight 名额（探测请求结束）
+                self.half_open_requests.fetch_sub(1, Ordering::SeqCst);
+
+                // HalfOpen 状态下失败，立即转为 Open
+                log::warn!(
+                    "Circuit breaker HalfOpen probe failed, transitioning to Open"
+                );
+                drop(config);
+                self.transition_to_open().await;
+            }
+            CircuitState::Closed => {
                 // 检查连续失败次数
-                if failures >= self.config.failure_threshold {
+                if failures >= config.failure_threshold {
                     log::warn!(
                         "Circuit breaker opening due to {} consecutive failures (threshold: {})",
                         failures,
-                        self.config.failure_threshold
+                        config.failure_threshold
                     );
+                    drop(config); // 释放读锁再转换状态
                     self.transition_to_open().await;
                 } else {
                     // 检查错误率
                     let total = self.total_requests.load(Ordering::SeqCst);
                     let failed = self.failed_requests.load(Ordering::SeqCst);
 
-                    if total >= self.config.min_requests {
+                    if total >= config.min_requests {
                         let error_rate = failed as f64 / total as f64;
                         log::debug!(
                             "Circuit breaker error rate: {:.2}% ({}/{} requests)",
@@ -186,12 +269,13 @@ impl CircuitBreaker {
                             total
                         );
 
-                        if error_rate >= self.config.error_rate_threshold {
+                        if error_rate >= config.error_rate_threshold {
                             log::warn!(
                                 "Circuit breaker opening due to high error rate: {:.2}% (threshold: {:.2}%)",
                                 error_rate * 100.0,
-                                self.config.error_rate_threshold * 100.0
+                                config.error_rate_threshold * 100.0
                             );
+                            drop(config); // 释放读锁再转换状态
                             self.transition_to_open().await;
                         }
                     }
@@ -238,6 +322,8 @@ impl CircuitBreaker {
     async fn transition_to_half_open(&self) {
         *self.state.write().await = CircuitState::HalfOpen;
         self.consecutive_successes.store(0, Ordering::SeqCst);
+        // 重置半开状态的请求限流计数
+        self.half_open_requests.store(0, Ordering::SeqCst);
     }
 
     /// 转换到关闭状态

src-tauri/src/proxy/failover_switch.rs

@@ -0,0 +1,148 @@
+//! 故障转移切换模块
+//!
+//! 处理故障转移成功后的供应商切换逻辑，包括：
+//! - 去重控制（避免多个请求同时触发）
+//! - 数据库更新
+//! - 托盘菜单更新
+//! - 前端事件发射
+//! - Live 备份更新
+
+use crate::database::Database;
+use crate::error::AppError;
+use std::collections::HashSet;
+use std::str::FromStr;
+use std::sync::Arc;
+use tauri::{Emitter, Manager};
+use tokio::sync::RwLock;
+
+/// 故障转移切换管理器
+///
+/// 负责处理故障转移成功后的供应商切换，确保 UI 能够直观反映当前使用的供应商。
+#[derive(Clone)]
+pub struct FailoverSwitchManager {
+    /// 正在处理中的切换（key = "app_type:provider_id"）
+    pending_switches: Arc<RwLock<HashSet<String>>>,
+    db: Arc<Database>,
+}
+
+impl FailoverSwitchManager {
+    pub fn new(db: Arc<Database>) -> Self {
+        Self {
+            pending_switches: Arc::new(RwLock::new(HashSet::new())),
+            db,
+        }
+    }
+
+    /// 尝试执行故障转移切换
+    ///
+    /// 如果相同的切换已在进行中，则跳过；否则执行切换逻辑。
+    ///
+    /// # Returns
+    /// - `Ok(true)` - 切换成功执行
+    /// - `Ok(false)` - 切换已在进行中，跳过
+    /// - `Err(e)` - 切换过程中发生错误
+    pub async fn try_switch(
+        &self,
+        app_handle: Option<&tauri::AppHandle>,
+        app_type: &str,
+        provider_id: &str,
+        provider_name: &str,
+    ) -> Result<bool, AppError> {
+        let switch_key = format!("{}:{}", app_type, provider_id);
+
+        // 去重检查：如果相同切换已在进行中，跳过
+        {
+            let mut pending = self.pending_switches.write().await;
+            if pending.contains(&switch_key) {
+                log::debug!(
+                    "[Failover] 切换已在进行中，跳过: {} -> {}",
+                    app_type,
+                    provider_id
+                );
+                return Ok(false);
+            }
+            pending.insert(switch_key.clone());
+        }
+
+        // 执行切换（确保最后清理 pending 标记）
+        let result = self
+            .do_switch(app_handle, app_type, provider_id, provider_name)
+            .await;
+
+        // 清理 pending 标记
+        {
+            let mut pending = self.pending_switches.write().await;
+            pending.remove(&switch_key);
+        }
+
+        result
+    }
+
+    async fn do_switch(
+        &self,
+        app_handle: Option<&tauri::AppHandle>,
+        app_type: &str,
+        provider_id: &str,
+        provider_name: &str,
+    ) -> Result<bool, AppError> {
+        log::info!(
+            "[Failover] 开始切换供应商: {} -> {} ({})",
+            app_type,
+            provider_name,
+            provider_id
+        );
+
+        // 1. 更新数据库 is_current
+        self.db.set_current_provider(app_type, provider_id)?;
+
+        // 2. 更新本地 settings（设备级）
+        let app_type_enum = crate::app_config::AppType::from_str(app_type)
+            .map_err(|_| AppError::Message(format!("无效的应用类型: {}", app_type)))?;
+        crate::settings::set_current_provider(&app_type_enum, Some(provider_id))?;
+
+        // 3. 更新托盘菜单和发射事件
+        if let Some(app) = app_handle {
+            // 更新托盘菜单
+            if let Some(app_state) = app.try_state::<crate::store::AppState>() {
+                // 更新 Live 备份（确保代理停止时恢复正确配置）
+                if let Ok(Some(provider)) = self.db.get_provider_by_id(provider_id, app_type) {
+                    if let Err(e) = app_state
+                        .proxy_service
+                        .update_live_backup_from_provider(app_type, &provider)
+                        .await
+                    {
+                        log::warn!("[Failover] 更新 Live 备份失败: {e}");
+                    }
+                }
+
+                // 重建托盘菜单
+                if let Ok(new_menu) = crate::tray::create_tray_menu(app, app_state.inner()) {
+                    if let Some(tray) = app.tray_by_id("main") {
+                        if let Err(e) = tray.set_menu(Some(new_menu)) {
+                            log::error!("[Failover] 更新托盘菜单失败: {e}");
+                        }
+                    }
+                }
+            }
+
+            // 发射事件到前端
+            let event_data = serde_json::json!({
+                "appType": app_type,
+                "providerId": provider_id,
+                "source": "failover"  // 标识来源是故障转移
+            });
+            if let Err(e) = app.emit("provider-switched", event_data) {
+                log::error!("[Failover] 发射供应商切换事件失败: {e}");
+            }
+        }
+
+        log::info!(
+            "[Failover] 供应商切换完成: {} -> {} ({})",
+            app_type,
+            provider_name,
+            provider_id
+        );
+
+        Ok(true)
+    }
+}

src-tauri/src/proxy/forwarder.rs

@@ -4,12 +4,13 @@
 
 use super::{
     error::*,
-    provider_router::ProviderRouter as NewProviderRouter,
+    failover_switch::FailoverSwitchManager,
+    provider_router::ProviderRouter,
     providers::{get_adapter, ProviderAdapter},
     types::ProxyStatus,
     ProxyError,
 };
-use crate::{app_config::AppType, database::Database, provider::Provider};
+use crate::{app_config::AppType, provider::Provider};
 use reqwest::{Client, Response};
 use serde_json::Value;
 use std::sync::Arc;
@@ -18,20 +19,27 @@ use tokio::sync::RwLock;
 
 pub struct RequestForwarder {
     client: Client,
-    router: Arc<NewProviderRouter>,
-    #[allow(dead_code)]
+    /// 共享的 ProviderRouter（持有熔断器状态）
+    router: Arc<ProviderRouter>,
+    /// 单个 Provider 内的最大重试次数
     max_retries: u8,
     status: Arc<RwLock<ProxyStatus>>,
     current_providers: Arc<RwLock<std::collections::HashMap<String, (String, String)>>>,
+    /// 故障转移切换管理器
+    failover_manager: Arc<FailoverSwitchManager>,
+    /// AppHandle，用于发射事件和更新托盘
+    app_handle: Option<tauri::AppHandle>,
 }
 
 impl RequestForwarder {
     pub fn new(
-        db: Arc<Database>,
+        router: Arc<ProviderRouter>,
         timeout_secs: u64,
         max_retries: u8,
         status: Arc<RwLock<ProxyStatus>>,
         current_providers: Arc<RwLock<std::collections::HashMap<String, (String, String)>>>,
+        failover_manager: Arc<FailoverSwitchManager>,
+        app_handle: Option<tauri::AppHandle>,
     ) -> Self {
         let mut client_builder = Client::builder();
         if timeout_secs > 0 {
@@ -44,32 +52,90 @@ impl RequestForwarder {
 
         Self {
             client,
-            router: Arc::new(NewProviderRouter::new(db)),
+            router,
             max_retries,
             status,
             current_providers,
+            failover_manager,
+            app_handle,
         }
     }
 
+    /// 对单个 Provider 执行请求（带重试）
+    ///
+    /// 在同一个 Provider 上最多重试 max_retries 次，使用指数退避
+    async fn forward_with_provider_retry(
+        &self,
+        provider: &Provider,
+        endpoint: &str,
+        body: &Value,
+        headers: &axum::http::HeaderMap,
+        adapter: &dyn ProviderAdapter,
+    ) -> Result<Response, ProxyError> {
+        let mut last_error = None;
+
+        for attempt in 0..=self.max_retries {
+            if attempt > 0 {
+                // 指数退避：100ms, 200ms, 400ms, ...
+                let delay_ms = 100 * 2u64.pow(attempt as u32 - 1);
+                log::info!(
+                    "[{}] 重试第 {}/{} 次（等待 {}ms）",
+                    adapter.name(),
+                    attempt,
+                    self.max_retries,
+                    delay_ms
+                );
+                tokio::time::sleep(Duration::from_millis(delay_ms)).await;
+            }
+
+            match self
+                .forward(provider, endpoint, body, headers, adapter)
+                .await
+            {
+                Ok(response) => return Ok(response),
+                Err(e) => {
+                    let category = self.categorize_proxy_error(&e);
+
+                    // 只有可重试的错误才继续重试
+                    if category == ErrorCategory::NonRetryable {
+                        return Err(e);
+                    }
+
+                    log::debug!(
+                        "[{}] Provider {} 第 {} 次请求失败: {}",
+                        adapter.name(),
+                        provider.name,
+                        attempt + 1,
+                        e
+                    );
+                    last_error = Some(e);
+                }
+            }
+        }
+
+        Err(last_error.unwrap_or(ProxyError::MaxRetriesExceeded))
+    }
+
     /// 转发请求（带故障转移）
+    ///
+    /// # Arguments
+    /// * `app_type` - 应用类型
+    /// * `endpoint` - API 端点
+    /// * `body` - 请求体
+    /// * `headers` - 请求头
+    /// * `providers` - 已选择的 Provider 列表（由 RequestContext 提供，避免重复调用 select_providers）
     pub async fn forward_with_retry(
         &self,
         app_type: &AppType,
         endpoint: &str,
         body: Value,
         headers: axum::http::HeaderMap,
+        providers: Vec<Provider>,
     ) -> Result<Response, ProxyError> {
         // 获取适配器
         let adapter = get_adapter(app_type);
         let app_type_str = app_type.as_str();
 
-        // 使用新的 ProviderRouter 选择所有可用供应商
-        let providers = self
-            .router
-            .select_providers(app_type_str)
-            .await
-            .map_err(|e| ProxyError::DatabaseError(e.to_string()))?;
-
         if providers.is_empty() {
             return Err(ProxyError::NoAvailableProvider);
         }
@@ -82,13 +148,33 @@ impl RequestForwarder {
 
         let mut last_error = None;
         let mut failover_happened = false;
+        let mut attempted_providers = 0usize;
 
         // 依次尝试每个供应商
-        for (attempt, provider) in providers.iter().enumerate() {
+        for provider in providers.iter() {
+            // 发起请求前先获取熔断器放行许可（HalfOpen 会占用探测名额）
+            if !self
+                .router
+                .allow_provider_request(&provider.id, app_type_str)
+                .await
+            {
+                log::debug!(
+                    "[{}] Provider {} 熔断器拒绝本次请求，跳过",
+                    app_type_str,
+                    provider.name
+                );
+                continue;
+            }
+
+            attempted_providers += 1;
+            if attempted_providers > 1 {
+                failover_happened = true;
+            }
+
             log::info!(
                 "[{}] 尝试 {}/{} - 使用Provider: {} (sort_index: {})",
                 app_type_str,
-                attempt + 1,
+                attempted_providers,
                 providers.len(),
                 provider.name,
                 provider.sort_index.unwrap_or(999999)
@@ -101,16 +187,13 @@ impl RequestForwarder {
                 status.current_provider_id = Some(provider.id.clone());
                 status.total_requests += 1;
                 status.last_request_at = Some(chrono::Utc::now().to_rfc3339());
-                if attempt > 0 {
-                    failover_happened = true;
-                }
             }
 
             let start = Instant::now();
 
-            // 转发请求
+            // 转发请求（带单 Provider 内重试）
             match self
-                .forward(provider, endpoint, &body, &headers, adapter.as_ref())
+                .forward_with_provider_retry(provider, endpoint, &body, &headers, adapter.as_ref())
                 .await
             {
                 Ok(response) => {
@@ -147,6 +230,20 @@ impl RequestForwarder {
                                 provider.name,
                                 latency
                             );
+
+                            // 异步触发供应商切换，更新 UI 和托盘菜单
+                            let fm = self.failover_manager.clone();
+                            let ah = self.app_handle.clone();
+                            let pid = provider.id.clone();
+                            let pname = provider.name.clone();
+                            let at = app_type_str.to_string();
+
+                            tokio::spawn(async move {
+                                if let Err(e) = fm.try_switch(ah.as_ref(), &at, &pid, &pname).await
+                                {
+                                    log::error!("[Failover] 切换供应商失败: {e}");
+                                }
+                            });
                         }
                         // 重新计算成功率
                         if status.total_requests > 0 {
@@ -226,6 +323,21 @@ impl RequestForwarder {
             }
         }
 
+        if attempted_providers == 0 {
+            // providers 列表非空，但全部被熔断器拒绝（典型：HalfOpen 探测名额被占用）
+            {
+                let mut status = self.status.write().await;
+                status.failed_requests += 1;
+                status.last_error = Some("所有供应商暂时不可用（熔断器限制）".to_string());
+                if status.total_requests > 0 {
+                    status.success_rate = (status.success_requests as f32
+                        / status.total_requests as f32)
+                        * 100.0;
+                }
+            }
+            return Err(ProxyError::NoAvailableProvider);
+        }
+
         // 所有供应商都失败了
         {
             let mut status = self.status.write().await;
@@ -373,21 +485,24 @@ impl RequestForwarder {
     }
 
     /// 分类ProxyError
+    ///
+    /// 决定哪些错误应该触发故障转移到下一个 Provider
+    ///
+    /// 设计原则：既然用户配置了多个供应商，就应该让所有供应商都尝试一遍。
+    /// 只有明确是客户端中断的情况才不重试。
     fn categorize_proxy_error(&self, error: &ProxyError) -> ErrorCategory {
         match error {
+            // 网络和上游错误：都应该尝试下一个供应商
             ProxyError::Timeout(_) => ErrorCategory::Retryable,
             ProxyError::ForwardFailed(_) => ErrorCategory::Retryable,
-            ProxyError::UpstreamError { status, .. } => {
-                if *status >= 500 {
-                    ErrorCategory::Retryable
-                } else if *status >= 400 && *status < 500 {
-                    ErrorCategory::NonRetryable
-                } else {
-                    ErrorCategory::Retryable
-                }
-            }
             ProxyError::ProviderUnhealthy(_) => ErrorCategory::Retryable,
+            // 上游 HTTP 错误：无论状态码如何，都尝试下一个供应商
+            // 原因：不同供应商有不同的限制和认证，一个供应商的 4xx 错误
+            // 不代表其他供应商也会失败
+            ProxyError::UpstreamError { .. } => ErrorCategory::Retryable,
+            // 无可用供应商：所有供应商都试过了，无法重试
             ProxyError::NoAvailableProvider => ErrorCategory::NonRetryable,
+            // 其他错误（配置错误、数据库错误等）：不是供应商问题，无需重试
             _ => ErrorCategory::NonRetryable,
         }
     }

src-tauri/src/proxy/handler_config.rs

@@ -0,0 +1,164 @@
+//! Handler 配置模块
+//!
+//! 定义各 API 处理器的配置结构和使用量解析器
+
+use crate::app_config::AppType;
+use crate::proxy::usage::parser::TokenUsage;
+use serde_json::Value;
+
+/// 使用量解析器类型别名
+pub type StreamUsageParser = fn(&[Value]) -> Option<TokenUsage>;
+pub type ResponseUsageParser = fn(&Value) -> Option<TokenUsage>;
+
+/// 模型提取器类型别名
+/// 参数: (流式事件列表, 请求中的模型名称) -> 最终使用的模型名称
+pub type StreamModelExtractor = fn(&[Value], &str) -> String;
+
+/// 各 API 的使用量解析配置
+#[derive(Clone, Copy)]
+pub struct UsageParserConfig {
+    /// 流式响应解析器
+    pub stream_parser: StreamUsageParser,
+    /// 非流式响应解析器
+    pub response_parser: ResponseUsageParser,
+    /// 流式响应中的模型提取器
+    pub model_extractor: StreamModelExtractor,
+    /// 应用类型字符串（用于日志记录）
+    pub app_type_str: &'static str,
+}
+
+// ============================================================================
+// 模型提取器实现
+// ============================================================================
+
+/// Claude 流式响应模型提取（直接使用请求模型）
+fn claude_model_extractor(_events: &[Value], request_model: &str) -> String {
+    request_model.to_string()
+}
+
+/// OpenAI Chat Completions 流式响应模型提取
+fn openai_model_extractor(events: &[Value], request_model: &str) -> String {
+    events
+        .iter()
+        .find_map(|e| e.get("model")?.as_str())
+        .unwrap_or(request_model)
+        .to_string()
+}
+
+/// Codex Responses API 流式响应模型提取
+fn codex_model_extractor(events: &[Value], request_model: &str) -> String {
+    events
+        .iter()
+        .find_map(|e| {
+            if e.get("type")?.as_str()? == "response.completed" {
+                e.get("response")?.get("model")?.as_str()
+            } else {
+                None
+            }
+        })
+        .unwrap_or(request_model)
+        .to_string()
+}
+
+/// Gemini 流式响应模型提取（优先使用 usage.model）
+fn gemini_model_extractor(events: &[Value], request_model: &str) -> String {
+    // 首先尝试从解析的 usage 中获取模型
+    if let Some(usage) = TokenUsage::from_gemini_stream_chunks(events) {
+        if let Some(model) = usage.model {
+            return model;
+        }
+    }
+    request_model.to_string()
+}
+
+// ============================================================================
+// 预定义配置
+// ============================================================================
+
+/// Claude API 解析配置
+pub const CLAUDE_PARSER_CONFIG: UsageParserConfig = UsageParserConfig {
+    stream_parser: TokenUsage::from_claude_stream_events,
+    response_parser: TokenUsage::from_claude_response,
+    model_extractor: claude_model_extractor,
+    app_type_str: "claude",
+};
+
+/// OpenAI Chat Completions API 解析配置（用于 Codex /v1/chat/completions）
+pub const OPENAI_PARSER_CONFIG: UsageParserConfig = UsageParserConfig {
+    stream_parser: TokenUsage::from_openai_stream_events,
+    response_parser: TokenUsage::from_openai_response,
+    model_extractor: openai_model_extractor,
+    app_type_str: "codex",
+};
+
+/// Codex Responses API 解析配置（用于 /v1/responses）
+pub const CODEX_PARSER_CONFIG: UsageParserConfig = UsageParserConfig {
+    stream_parser: TokenUsage::from_codex_stream_events,
+    response_parser: TokenUsage::from_codex_response,
+    model_extractor: codex_model_extractor,
+    app_type_str: "codex",
+};
+
+/// Gemini API 解析配置
+pub const GEMINI_PARSER_CONFIG: UsageParserConfig = UsageParserConfig {
+    stream_parser: TokenUsage::from_gemini_stream_chunks,
+    response_parser: TokenUsage::from_gemini_response,
+    model_extractor: gemini_model_extractor,
+    app_type_str: "gemini",
+};
+
+// ============================================================================
+// Handler 配置（预留，用于进一步简化）
+// ============================================================================
+
+/// Handler 基础配置
+///
+/// 预留结构，可用于进一步统一各 handler 的配置
+#[allow(dead_code)]
+#[derive(Clone)]
+pub struct HandlerConfig {
+    /// 应用类型
+    pub app_type: AppType,
+    /// 日志标签
+    pub tag: &'static str,
+    /// 应用类型字符串
+    pub app_type_str: &'static str,
+    /// 使用量解析配置
+    pub parser_config: &'static UsageParserConfig,
+}
+
+/// Claude Handler 配置
+#[allow(dead_code)]
+pub const CLAUDE_HANDLER_CONFIG: HandlerConfig = HandlerConfig {
+    app_type: AppType::Claude,
+    tag: "Claude",
+    app_type_str: "claude",
+    parser_config: &CLAUDE_PARSER_CONFIG,
+};
+
+/// Codex Chat Completions Handler 配置
+#[allow(dead_code)]
+pub const CODEX_CHAT_HANDLER_CONFIG: HandlerConfig = HandlerConfig {
+    app_type: AppType::Codex,
+    tag: "Codex",
+    app_type_str: "codex",
+    parser_config: &OPENAI_PARSER_CONFIG,
+};
+
+/// Codex Responses Handler 配置
+#[allow(dead_code)]
+pub const CODEX_RESPONSES_HANDLER_CONFIG: HandlerConfig = HandlerConfig {
+    app_type: AppType::Codex,
+    tag: "Codex",
+    app_type_str: "codex",
+    parser_config: &CODEX_PARSER_CONFIG,
+};
+
+/// Gemini Handler 配置
+#[allow(dead_code)]
+pub const GEMINI_HANDLER_CONFIG: HandlerConfig = HandlerConfig {
+    app_type: AppType::Gemini,
+    tag: "Gemini",
+    app_type_str: "gemini",
+    parser_config: &GEMINI_PARSER_CONFIG,
+};

src-tauri/src/proxy/handler_context.rs

@@ -0,0 +1,151 @@
+//! 请求上下文模块
+//!
+//! 提供请求生命周期的上下文管理，封装通用初始化逻辑
+
+use crate::app_config::AppType;
+use crate::provider::Provider;
+use crate::proxy::{
+    forwarder::RequestForwarder, server::ProxyState, types::ProxyConfig, ProxyError,
+};
+use std::time::Instant;
+
+/// 请求上下文
+///
+/// 贯穿整个请求生命周期，包含：
+/// - 计时信息
+/// - 代理配置
+/// - 选中的 Provider 列表（用于故障转移）
+/// - 请求模型名称
+/// - 日志标签
+pub struct RequestContext {
+    /// 请求开始时间
+    pub start_time: Instant,
+    /// 代理配置快照
+    pub config: ProxyConfig,
+    /// 选中的 Provider（故障转移链的第一个）
+    pub provider: Provider,
+    /// 完整的 Provider 列表（用于故障转移）
+    providers: Vec<Provider>,
+    /// 请求中的模型名称
+    pub request_model: String,
+    /// 日志标签（如 "Claude"、"Codex"、"Gemini"）
+    pub tag: &'static str,
+    /// 应用类型字符串（如 "claude"、"codex"、"gemini"）
+    pub app_type_str: &'static str,
+    /// 应用类型（预留，目前通过 app_type_str 使用）
+    #[allow(dead_code)]
+    pub app_type: AppType,
+}
+
+impl RequestContext {
+    /// 创建请求上下文
+    ///
+    /// # Arguments
+    /// * `state` - 代理服务器状态
+    /// * `body` - 请求体 JSON
+    /// * `app_type` - 应用类型
+    /// * `tag` - 日志标签
+    /// * `app_type_str` - 应用类型字符串
+    ///
+    /// # Errors
+    /// 返回 `ProxyError` 如果 Provider 选择失败
+    pub async fn new(
+        state: &ProxyState,
+        body: &serde_json::Value,
+        app_type: AppType,
+        tag: &'static str,
+        app_type_str: &'static str,
+    ) -> Result<Self, ProxyError> {
+        let start_time = Instant::now();
+        let config = state.config.read().await.clone();
+
+        // 从请求体提取模型名称
+        let request_model = body
+            .get("model")
+            .and_then(|m| m.as_str())
+            .unwrap_or("unknown")
+            .to_string();
+
+        // 使用共享的 ProviderRouter 选择 Provider（熔断器状态跨请求保持）
+        // 注意：只在这里调用一次，结果传递给 forwarder，避免重复消耗 HalfOpen 名额
+        let providers = state
+            .provider_router
+            .select_providers(app_type_str)
+            .await
+            .map_err(|e| ProxyError::DatabaseError(e.to_string()))?;
+
+        let provider = providers
+            .first()
+            .cloned()
+            .ok_or(ProxyError::NoAvailableProvider)?;
+
+        log::info!(
+            "[{}] Provider: {}, model: {}, failover chain: {} providers",
+            tag,
+            provider.name,
+            request_model,
+            providers.len()
+        );
+
+        Ok(Self {
+            start_time,
+            config,
+            provider,
+            providers,
+            request_model,
+            tag,
+            app_type_str,
+            app_type,
+        })
+    }
+
+    /// 从 URI 提取模型名称（Gemini 专用）
+    ///
+    /// Gemini API 的模型名称在 URI 中，格式如：
+    /// `/v1beta/models/gemini-pro:generateContent`
+    pub fn with_model_from_uri(mut self, uri: &axum::http::Uri) -> Self {
+        let endpoint = uri
+            .path_and_query()
+            .map(|pq| pq.as_str())
+            .unwrap_or(uri.path());
+
+        self.request_model = endpoint
+            .split('/')
+            .find(|s| s.starts_with("models/"))
+            .and_then(|s| s.strip_prefix("models/"))
+            .map(|s| s.split(':').next().unwrap_or(s))
+            .unwrap_or("unknown")
+            .to_string();
+
+        log::info!("[{}] 从 URI 提取模型: {}", self.tag, self.request_model);
+        self
+    }
+
+    /// 创建 RequestForwarder
+    ///
+    /// 使用共享的 ProviderRouter，确保熔断器状态跨请求保持
+    pub fn create_forwarder(&self, state: &ProxyState) -> RequestForwarder {
+        RequestForwarder::new(
+            state.provider_router.clone(),
+            self.config.request_timeout,
+            self.config.max_retries,
+            state.status.clone(),
+            state.current_providers.clone(),
+            state.failover_manager.clone(),
+            state.app_handle.clone(),
+        )
+    }
+
+    /// 获取 Provider 列表（用于故障转移）
+    ///
+    /// 返回在创建上下文时已选择的 providers，避免重复调用 select_providers()
+    pub fn get_providers(&self) -> Vec<Provider> {
+        self.providers.clone()
+    }
+
+    /// 计算请求延迟（毫秒）
+    #[inline]
+    pub fn latency_ms(&self) -> u64 {
+        self.start_time.elapsed().as_millis() as u64
+    }
+}

src-tauri/src/proxy/mod.rs

@@ -5,13 +5,16 @@
 pub mod circuit_breaker;
 pub mod error;
 pub mod error_mapper;
+pub(crate) mod failover_switch;
 mod forwarder;
+pub mod handler_config;
+pub mod handler_context;
 mod handlers;
 mod health;
 pub mod provider_router;
 pub mod providers;
 pub mod response_handler;
-mod router;
+pub mod response_processor;
 pub(crate) mod server;
 pub mod session;
 pub(crate) mod types;

src-tauri/src/proxy/provider_router.rs

@@ -5,7 +5,7 @@
 use crate::database::Database;
 use crate::error::AppError;
 use crate::provider::Provider;
-use crate::proxy::circuit_breaker::CircuitBreaker;
+use crate::proxy::circuit_breaker::{CircuitBreaker, CircuitBreakerConfig};
 use std::collections::HashMap;
 use std::sync::Arc;
 use tokio::sync::RwLock;
@@ -28,44 +28,106 @@ impl ProviderRouter {
     }
 
     /// 选择可用的供应商（支持故障转移）
-    /// 返回按优先级排序的可用供应商列表
+    ///
+    /// 返回按优先级排序的可用供应商列表：
+    /// 1. 当前供应商（is_current=true）始终第一位
+    /// 2. 故障转移队列中的其他供应商（按 queue_order 排序）
+    /// 3. 只返回熔断器未打开的供应商
     pub async fn select_providers(&self, app_type: &str) -> Result<Vec<Provider>, AppError> {
-        // 直接获取当前选中的供应商（基于 is_current 字段）
-        let current_id = self
-            .db
-            .get_current_provider(app_type)?
-            .ok_or_else(|| AppError::Config(format!("No current provider for {app_type}")))?;
+        let mut result = Vec::new();
+        let all_providers = self.db.get_all_providers(app_type)?;
 
-        let providers = self.db.get_all_providers(app_type)?;
-        let provider = providers
-            .get(&current_id)
-            .ok_or_else(|| AppError::Config(format!("Current provider {current_id} not found")))?
-            .clone();
+        // 1. 当前供应商始终第一位
+        if let Some(current_id) = self.db.get_current_provider(app_type)? {
+            if let Some(current) = all_providers.get(&current_id) {
+                let circuit_key = format!("{}:{}", app_type, current.id);
+                let breaker = self.get_or_create_circuit_breaker(&circuit_key).await;
 
-        log::info!(
-            "[{}] Selected current provider: {} ({})",
-            app_type,
-            provider.name,
-            provider.id
-        );
+                if breaker.is_available().await {
+                    log::info!(
+                        "[{}] Current provider available: {} ({})",
+                        app_type,
+                        current.name,
+                        current.id
+                    );
+                    result.push(current.clone());
+                } else {
+                    log::warn!(
+                        "[{}] Current provider {} circuit breaker open, checking failover queue",
+                        app_type,
+                        current.name
+                    );
+                }
+            }
+        }
 
-        // 检查熔断器状态
-        let circuit_key = format!("{}:{}", app_type, provider.id);
-        let breaker = self.get_or_create_circuit_breaker(&circuit_key).await;
+        // 2. 获取故障转移队列中的供应商
+        let queue = self.db.get_failover_queue(app_type)?;
 
-        if !breaker.allow_request().await {
-            log::warn!(
-                "Provider {} is unavailable (circuit breaker open)",
-                provider.id
-            );
+        for item in queue {
+            // 跳过已添加的当前供应商
+            if result.iter().any(|p| p.id == item.provider_id) {
+                continue;
+            }
+
+            // 跳过禁用的队列项
+            if !item.enabled {
+                continue;
+            }
+
+            // 获取供应商信息
+            if let Some(provider) = all_providers.get(&item.provider_id) {
+                // 检查熔断器状态
+                let circuit_key = format!("{}:{}", app_type, provider.id);
+                let breaker = self.get_or_create_circuit_breaker(&circuit_key).await;
+
+                if breaker.is_available().await {
+                    log::info!(
+                        "[{}] Failover provider available: {} ({}) at queue position {}",
+                        app_type,
+                        provider.name,
+                        provider.id,
+                        item.queue_order
+                    );
+                    result.push(provider.clone());
+                } else {
+                    log::debug!(
+                        "[{}] Failover provider {} circuit breaker open, skipping",
+                        app_type,
+                        provider.name
+                    );
+                }
+            }
+        }
+
+        if result.is_empty() {
             return Err(AppError::Config(format!(
-                "Current provider {} is unavailable (circuit breaker open)",
-                provider.name
+                "No available provider for {} (all circuit breakers open or no providers configured)",
+                app_type
             )));
         }
 
-        // 返回单个供应商（保留 Vec 接口以兼容现有代码）
-        Ok(vec![provider])
+        log::info!(
+            "[{}] Failover chain: {} provider(s) available",
+            app_type,
+            result.len()
+        );
+
+        Ok(result)
+    }
+
+    /// 请求执行前获取熔断器“放行许可”
+    ///
+    /// - Closed：直接放行
+    /// - Open：超时到达后切到 HalfOpen 并放行一次探测
+    /// - HalfOpen：按限流规则放行探测
+    ///
+    /// 注意：调用方必须在请求结束后通过 `record_result()` 释放 HalfOpen 名额，
+    /// 否则会导致该 Provider 长时间无法进入探测状态。
+    pub async fn allow_provider_request(&self, provider_id: &str, app_type: &str) -> bool {
+        let circuit_key = format!("{app_type}:{provider_id}");
+        let breaker = self.get_or_create_circuit_breaker(&circuit_key).await;
+        breaker.allow_request().await
     }
 
     /// 记录供应商请求结果
@@ -76,7 +138,11 @@ impl ProviderRouter {
         success: bool,
         error_msg: Option<String>,
     ) -> Result<(), AppError> {
-        // 1. 更新熔断器状态
+        // 1. 获取熔断器配置（用于更新健康状态和判断是否禁用）
+        let config = self.db.get_circuit_breaker_config().await.ok();
+        let failure_threshold = config.map(|c| c.failure_threshold).unwrap_or(5);
+
+        // 2. 更新熔断器状态
         let circuit_key = format!("{app_type}:{provider_id}");
         let breaker = self.get_or_create_circuit_breaker(&circuit_key).await;
 
@@ -92,38 +158,21 @@ impl ProviderRouter {
             );
         }
 
-        // 2. 更新数据库健康状态
+        // 3. 更新数据库健康状态（使用配置的阈值）
         self.db
-            .update_provider_health(provider_id, app_type, success, error_msg.clone())
+            .update_provider_health_with_threshold(
+                provider_id,
+                app_type,
+                success,
+                error_msg.clone(),
+                failure_threshold,
+            )
             .await?;
 
-        // 3. 如果连续失败达到熔断阈值，自动禁用代理目标
-        if !success {
-            let health = self.db.get_provider_health(provider_id, app_type).await?;
-
-            // 获取熔断器配置
-            let config = self.db.get_circuit_breaker_config().await.ok();
-            let failure_threshold = config.map(|c| c.failure_threshold).unwrap_or(5);
-
-            // 如果连续失败达到阈值，自动关闭该供应商的代理开关
-            if health.consecutive_failures >= failure_threshold {
-                log::warn!(
-                    "Provider {} has failed {} times (threshold: {}), auto-disabling proxy target",
-                    provider_id,
-                    health.consecutive_failures,
-                    failure_threshold
-                );
-                self.db
-                    .set_proxy_target(provider_id, app_type, false)
-                    .await?;
-            }
-        }
-
         Ok(())
     }
 
     /// 重置熔断器（手动恢复）
-    #[allow(dead_code)]
     pub async fn reset_circuit_breaker(&self, circuit_key: &str) {
         let breakers = self.circuit_breakers.read().await;
         if let Some(breaker) = breakers.get(circuit_key) {
@@ -132,6 +181,27 @@ impl ProviderRouter {
         }
     }
 
+    /// 重置指定供应商的熔断器
+    pub async fn reset_provider_breaker(&self, provider_id: &str, app_type: &str) {
+        let circuit_key = format!("{app_type}:{provider_id}");
+        self.reset_circuit_breaker(&circuit_key).await;
+    }
+
+    /// 更新所有熔断器的配置（热更新）
+    ///
+    /// 当用户在 UI 中修改熔断器配置后调用此方法，
+    /// 所有现有的熔断器会立即使用新配置
+    pub async fn update_all_configs(&self, config: CircuitBreakerConfig) {
+        let breakers = self.circuit_breakers.read().await;
+        let count = breakers.len();
+
+        for breaker in breakers.values() {
+            breaker.update_config(config.clone()).await;
+        }
+
+        log::info!("已更新 {} 个熔断器的配置", count);
+    }
+
     /// 获取熔断器状态
     #[allow(dead_code)]
     pub async fn get_circuit_breaker_stats(
@@ -187,6 +257,7 @@ impl ProviderRouter {
 mod tests {
     use super::*;
     use crate::database::Database;
+    use serde_json::json;
 
     #[tokio::test]
     async fn test_provider_router_creation() {
@@ -197,4 +268,44 @@ mod tests {
         let breaker = router.get_or_create_circuit_breaker("claude:test").await;
         assert!(breaker.allow_request().await);
     }
+
+    #[tokio::test]
+    async fn select_providers_does_not_consume_half_open_permit() {
+        let db = Arc::new(Database::memory().unwrap());
+
+        // 配置：让熔断器 Open 后立刻进入 HalfOpen（timeout_seconds=0），并用 1 次失败就打开熔断器
+        db.update_circuit_breaker_config(&CircuitBreakerConfig {
+            failure_threshold: 1,
+            timeout_seconds: 0,
+            ..Default::default()
+        })
+        .await
+        .unwrap();
+
+        // 准备 2 个 Provider：A（当前）+ B（队列）
+        let provider_a =
+            Provider::with_id("a".to_string(), "Provider A".to_string(), json!({}), None);
+        let provider_b =
+            Provider::with_id("b".to_string(), "Provider B".to_string(), json!({}), None);
+
+        db.save_provider("claude", &provider_a).unwrap();
+        db.save_provider("claude", &provider_b).unwrap();
+        db.set_current_provider("claude", "a").unwrap();
+        db.add_to_failover_queue("claude", "b").unwrap();
+
+        let router = ProviderRouter::new(db.clone());
+
+        // 让 B 进入 Open 状态（failure_threshold=1）
+        router
+            .record_result("b", "claude", false, Some("fail".to_string()))
+            .await
+            .unwrap();
+
+        // select_providers 只做“可用性判断”，不应占用 HalfOpen 探测名额
+        let providers = router.select_providers("claude").await.unwrap();
+        assert_eq!(providers.len(), 2);
+
+        // 如果 select_providers 错误地消耗了 HalfOpen 名额，这里会返回 false（被限流拒绝）
+        assert!(router.allow_provider_request("b", "claude").await);
+    }
 }

src-tauri/src/proxy/providers/claude.rs

@@ -253,7 +253,6 @@ mod tests {
             meta: None,
             icon: None,
             icon_color: None,
-            is_proxy_target: None,
         }
     }
 

src-tauri/src/proxy/providers/codex.rs

@@ -174,7 +174,6 @@ mod tests {
             meta: None,
             icon: None,
             icon_color: None,
-            is_proxy_target: None,
         }
     }
 

src-tauri/src/proxy/providers/gemini.rs

@@ -120,11 +120,7 @@ impl GeminiAdapter {
     /// 从 Provider 配置中提取原始 API Key
     fn extract_key_raw(&self, provider: &Provider) -> Option<String> {
         if let Some(env) = provider.settings_config.get("env") {
-            // 优先使用 GOOGLE_GEMINI_API_KEY
-            if let Some(key) = env.get("GOOGLE_GEMINI_API_KEY").and_then(|v| v.as_str()) {
-                return Some(key.to_string());
-            }
-            // 备选 GEMINI_API_KEY
+            // 使用 GEMINI_API_KEY
             if let Some(key) = env.get("GEMINI_API_KEY").and_then(|v| v.as_str()) {
                 return Some(key.to_string());
             }
@@ -254,7 +250,6 @@ mod tests {
             meta: None,
             icon: None,
             icon_color: None,
-            is_proxy_target: None,
         }
     }
 
@@ -276,7 +271,7 @@ mod tests {
         let adapter = GeminiAdapter::new();
         let provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "AIza-test-key-12345678"
+                "GEMINI_API_KEY": "AIza-test-key-12345678"
             }
         }));
 
@@ -291,7 +286,7 @@ mod tests {
         let adapter = GeminiAdapter::new();
         let provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "ya29.test-access-token-12345"
+                "GEMINI_API_KEY": "ya29.test-access-token-12345"
             }
         }));
 
@@ -308,7 +303,7 @@ mod tests {
         let adapter = GeminiAdapter::new();
         let provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "{\"access_token\":\"ya29.test-token\",\"refresh_token\":\"1//refresh\"}"
+                "GEMINI_API_KEY": "{\"access_token\":\"ya29.test-token\",\"refresh_token\":\"1//refresh\"}"
             }
         }));
 
@@ -324,7 +319,7 @@ mod tests {
         // API Key
         let api_key_provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "AIza-test-key"
+                "GEMINI_API_KEY": "AIza-test-key"
             }
         }));
         assert_eq!(
@@ -335,7 +330,7 @@ mod tests {
         // OAuth access_token
         let oauth_provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "ya29.test-token"
+                "GEMINI_API_KEY": "ya29.test-token"
             }
         }));
         assert_eq!(
@@ -346,7 +341,7 @@ mod tests {
         // OAuth JSON
         let oauth_json_provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "{\"access_token\":\"ya29.test\"}"
+                "GEMINI_API_KEY": "{\"access_token\":\"ya29.test\"}"
             }
         }));
         assert_eq!(

src-tauri/src/proxy/providers/mod.rs

@@ -205,7 +205,6 @@ mod tests {
             meta: None,
             icon: None,
             icon_color: None,
-            is_proxy_target: None,
         }
     }
 
@@ -369,7 +368,7 @@ mod tests {
     fn test_from_app_type_gemini_api_key() {
         let provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "AIza-test-key"
+                "GEMINI_API_KEY": "AIza-test-key"
             }
         }));
 
@@ -381,7 +380,7 @@ mod tests {
     fn test_from_app_type_gemini_cli_oauth() {
         let provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "ya29.test-access-token"
+                "GEMINI_API_KEY": "ya29.test-access-token"
             }
         }));
 
@@ -393,7 +392,7 @@ mod tests {
     fn test_from_app_type_gemini_cli_json() {
         let provider = create_provider(json!({
             "env": {
-                "GOOGLE_GEMINI_API_KEY": "{\"access_token\":\"ya29.test\",\"refresh_token\":\"1//test\"}"
+                "GEMINI_API_KEY": "{\"access_token\":\"ya29.test\",\"refresh_token\":\"1//test\"}"
             }
         }));
 

src-tauri/src/proxy/providers/transform.rs

@@ -394,7 +394,6 @@ mod tests {
             meta: None,
             icon: None,
             icon_color: None,
-            is_proxy_target: None,
         }
     }
 

src-tauri/src/proxy/response_processor.rs

@@ -0,0 +1,411 @@
+//! 响应处理器模块
+//!
+//! 统一处理流式和非流式 API 响应
+
+use super::{
+    handler_config::UsageParserConfig, handler_context::RequestContext, server::ProxyState,
+    usage::parser::TokenUsage, ProxyError,
+};
+use axum::response::Response;
+use bytes::Bytes;
+use futures::stream::{Stream, StreamExt};
+use rust_decimal::Decimal;
+use serde_json::Value;
+use std::{
+    str::FromStr,
+    sync::{
+        atomic::{AtomicBool, Ordering},
+        Arc,
+    },
+};
+use tokio::sync::Mutex;
+
+// ============================================================================
+// 公共接口
+// ============================================================================
+
+/// 检测响应是否为 SSE 流式响应
+#[inline]
+pub fn is_sse_response(response: &reqwest::Response) -> bool {
+    response
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .map(|ct| ct.contains("text/event-stream"))
+        .unwrap_or(false)
+}
+
+/// 处理流式响应
+pub async fn handle_streaming(
+    response: reqwest::Response,
+    ctx: &RequestContext,
+    state: &ProxyState,
+    parser_config: &UsageParserConfig,
+) -> Response {
+    log::info!("[{}] 流式透传响应 (SSE)", ctx.tag);
+
+    let status = response.status();
+    let mut builder = axum::response::Response::builder().status(status);
+
+    // 复制响应头
+    for (key, value) in response.headers() {
+        builder = builder.header(key, value);
+    }
+
+    // 创建字节流
+    let stream = response
+        .bytes_stream()
+        .map(|chunk| chunk.map_err(|e| std::io::Error::other(e.to_string())));
+
+    // 创建使用量收集器
+    let usage_collector = create_usage_collector(ctx, state, status.as_u16(), parser_config);
+
+    // 创建带日志的透传流
+    let logged_stream = create_logged_passthrough_stream(stream, ctx.tag, Some(usage_collector));
+
+    let body = axum::body::Body::from_stream(logged_stream);
+    builder.body(body).unwrap()
+}
+
+/// 处理非流式响应
+pub async fn handle_non_streaming(
+    response: reqwest::Response,
+    ctx: &RequestContext,
+    state: &ProxyState,
+    parser_config: &UsageParserConfig,
+) -> Result<Response, ProxyError> {
+    let response_headers = response.headers().clone();
+    let status = response.status();
+
+    // 读取响应体
+    let body_bytes = response.bytes().await.map_err(|e| {
+        log::error!("[{}] 读取响应失败: {e}", ctx.tag);
+        ProxyError::ForwardFailed(format!("Failed to read response body: {e}"))
+    })?;
+
+    // 解析并记录使用量
+    if let Ok(json_value) = serde_json::from_slice::<Value>(&body_bytes) {
+        log::info!(
+            "[{}] <<< 响应 JSON:\n{}",
+            ctx.tag,
+            serde_json::to_string_pretty(&json_value).unwrap_or_default()
+        );
+
+        // 解析使用量
+        if let Some(usage) = (parser_config.response_parser)(&json_value) {
+            let model = json_value
+                .get("model")
+                .and_then(|m| m.as_str())
+                .unwrap_or(&ctx.request_model);
+
+            spawn_log_usage(state, ctx, usage, model, status.as_u16(), false);
+        } else {
+            log::debug!(
+                "[{}] 未能解析 usage 信息，跳过记录",
+                parser_config.app_type_str
+            );
+        }
+    } else {
+        log::info!(
+            "[{}] <<< 响应 (非 JSON): {} bytes",
+            ctx.tag,
+            body_bytes.len()
+        );
+    }
+
+    log::info!("[{}] ====== 请求结束 ======", ctx.tag);
+
+    // 构建响应
+    let mut builder = axum::response::Response::builder().status(status);
+    for (key, value) in response_headers.iter() {
+        builder = builder.header(key, value);
+    }
+
+    let body = axum::body::Body::from(body_bytes);
+    Ok(builder.body(body).unwrap())
+}
+
+/// 通用响应处理入口
+///
+/// 根据响应类型自动选择流式或非流式处理
+pub async fn process_response(
+    response: reqwest::Response,
+    ctx: &RequestContext,
+    state: &ProxyState,
+    parser_config: &UsageParserConfig,
+) -> Result<Response, ProxyError> {
+    if is_sse_response(&response) {
+        Ok(handle_streaming(response, ctx, state, parser_config).await)
+    } else {
+        handle_non_streaming(response, ctx, state, parser_config).await
+    }
+}
+
+// ============================================================================
+// SSE 使用量收集器
+// ============================================================================
+
+type UsageCallbackWithTiming = Arc<dyn Fn(Vec<Value>, Option<u64>) + Send + Sync + 'static>;
+
+/// SSE 使用量收集器
+#[derive(Clone)]
+pub struct SseUsageCollector {
+    inner: Arc<SseUsageCollectorInner>,
+}
+
+struct SseUsageCollectorInner {
+    events: Mutex<Vec<Value>>,
+    first_event_time: Mutex<Option<std::time::Instant>>,
+    start_time: std::time::Instant,
+    on_complete: UsageCallbackWithTiming,
+    finished: AtomicBool,
+}
+
+impl SseUsageCollector {
+    /// 创建新的使用量收集器
+    pub fn new(
+        start_time: std::time::Instant,
+        callback: impl Fn(Vec<Value>, Option<u64>) + Send + Sync + 'static,
+    ) -> Self {
+        let on_complete: UsageCallbackWithTiming = Arc::new(callback);
+        Self {
+            inner: Arc::new(SseUsageCollectorInner {
+                events: Mutex::new(Vec::new()),
+                first_event_time: Mutex::new(None),
+                start_time,
+                on_complete,
+                finished: AtomicBool::new(false),
+            }),
+        }
+    }
+
+    /// 推送 SSE 事件
+    pub async fn push(&self, event: Value) {
+        // 记录首个事件时间
+        {
+            let mut first_time = self.inner.first_event_time.lock().await;
+            if first_time.is_none() {
+                *first_time = Some(std::time::Instant::now());
+            }
+        }
+        let mut events = self.inner.events.lock().await;
+        events.push(event);
+    }
+
+    /// 完成收集并触发回调
+    pub async fn finish(&self) {
+        if self.inner.finished.swap(true, Ordering::SeqCst) {
+            return;
+        }
+
+        let events = {
+            let mut guard = self.inner.events.lock().await;
+            std::mem::take(&mut *guard)
+        };
+
+        let first_token_ms = {
+            let first_time = self.inner.first_event_time.lock().await;
+            first_time.map(|t| (t - self.inner.start_time).as_millis() as u64)
+        };
+
+        (self.inner.on_complete)(events, first_token_ms);
+    }
+}
+
+// ============================================================================
+// 内部辅助函数
+// ============================================================================
+
+/// 创建使用量收集器
+fn create_usage_collector(
+    ctx: &RequestContext,
+    state: &ProxyState,
+    status_code: u16,
+    parser_config: &UsageParserConfig,
+) -> SseUsageCollector {
+    let state = state.clone();
+    let provider_id = ctx.provider.id.clone();
+    let request_model = ctx.request_model.clone();
+    let app_type_str = parser_config.app_type_str;
+    let tag = ctx.tag;
+    let start_time = ctx.start_time;
+    let stream_parser = parser_config.stream_parser;
+    let model_extractor = parser_config.model_extractor;
+
+    SseUsageCollector::new(start_time, move |events, first_token_ms| {
+        if let Some(usage) = stream_parser(&events) {
+            let model = model_extractor(&events, &request_model);
+            let latency_ms = start_time.elapsed().as_millis() as u64;
+
+            let state = state.clone();
+            let provider_id = provider_id.clone();
+
+            tokio::spawn(async move {
+                log_usage_internal(
+                    &state,
+                    &provider_id,
+                    app_type_str,
+                    &model,
+                    usage,
+                    latency_ms,
+                    first_token_ms,
+                    true, // is_streaming
+                    status_code,
+                )
+                .await;
+            });
+        } else {
+            log::debug!("[{tag}] 流式响应缺少 usage 统计，跳过消费记录");
+        }
+    })
+}
+
+/// 异步记录使用量
+fn spawn_log_usage(
+    state: &ProxyState,
+    ctx: &RequestContext,
+    usage: TokenUsage,
+    model: &str,
+    status_code: u16,
+    is_streaming: bool,
+) {
+    let state = state.clone();
+    let provider_id = ctx.provider.id.clone();
+    let app_type_str = ctx.app_type_str.to_string();
+    let model = model.to_string();
+    let latency_ms = ctx.latency_ms();
+
+    tokio::spawn(async move {
+        log_usage_internal(
+            &state,
+            &provider_id,
+            &app_type_str,
+            &model,
+            usage,
+            latency_ms,
+            None,
+            is_streaming,
+            status_code,
+        )
+        .await;
+    });
+}
+
+/// 内部使用量记录函数
+#[allow(clippy::too_many_arguments)]
+async fn log_usage_internal(
+    state: &ProxyState,
+    provider_id: &str,
+    app_type: &str,
+    model: &str,
+    usage: TokenUsage,
+    latency_ms: u64,
+    first_token_ms: Option<u64>,
+    is_streaming: bool,
+    status_code: u16,
+) {
+    use super::usage::logger::UsageLogger;
+
+    let logger = UsageLogger::new(&state.db);
+
+    // 获取 provider 的 cost_multiplier
+    let multiplier = match state.db.get_provider_by_id(provider_id, app_type) {
+        Ok(Some(p)) => {
+            if let Some(meta) = p.meta {
+                if let Some(cm) = meta.cost_multiplier {
+                    Decimal::from_str(&cm).unwrap_or(Decimal::from(1))
+                } else {
+                    Decimal::from(1)
+                }
+            } else {
+                Decimal::from(1)
+            }
+        }
+        _ => Decimal::from(1),
+    };
+
+    let request_id = uuid::Uuid::new_v4().to_string();
+
+    if let Err(e) = logger.log_with_calculation(
+        request_id,
+        provider_id.to_string(),
+        app_type.to_string(),
+        model.to_string(),
+        usage,
+        multiplier,
+        latency_ms,
+        first_token_ms,
+        status_code,
+        None,
+        None, // provider_type
+        is_streaming,
+    ) {
+        log::warn!("记录使用量失败: {e}");
+    }
+}
+
+/// 创建带日志记录的透传流
+pub fn create_logged_passthrough_stream(
+    stream: impl Stream<Item = Result<Bytes, std::io::Error>> + Send + 'static,
+    tag: &'static str,
+    usage_collector: Option<SseUsageCollector>,
+) -> impl Stream<Item = Result<Bytes, std::io::Error>> + Send {
+    async_stream::stream! {
+        let mut buffer = String::new();
+        let mut collector = usage_collector;
+
+        tokio::pin!(stream);
+
+        while let Some(chunk) = stream.next().await {
+            match chunk {
+                Ok(bytes) => {
+                    let text = String::from_utf8_lossy(&bytes);
+                    buffer.push_str(&text);
+
+                    // 尝试解析并记录完整的 SSE 事件
+                    while let Some(pos) = buffer.find("\n\n") {
+                        let event_text = buffer[..pos].to_string();
+                        buffer = buffer[pos + 2..].to_string();
+
+                        if !event_text.trim().is_empty() {
+                            // 提取 data 部分并尝试解析为 JSON
+                            for line in event_text.lines() {
+                                if let Some(data) = line.strip_prefix("data: ") {
+                                    if data.trim() != "[DONE]" {
+                                        if let Ok(json_value) = serde_json::from_str::<Value>(data) {
+                                            if let Some(c) = &collector {
+                                                c.push(json_value.clone()).await;
+                                            }
+                                            log::info!(
+                                                "[{}] <<< SSE 事件:\n{}",
+                                                tag,
+                                                serde_json::to_string_pretty(&json_value).unwrap_or_else(|_| data.to_string())
+                                            );
+                                        } else {
+                                            log::info!("[{tag}] <<< SSE 数据: {data}");
+                                        }
+                                    } else {
+                                        log::info!("[{tag}] <<< SSE: [DONE]");
+                                    }
+                                }
+                            }
+                        }
+                    }
+
+                    yield Ok(bytes);
+                }
+                Err(e) => {
+                    log::error!("[{tag}] 流错误: {e}");
+                    yield Err(std::io::Error::other(e.to_string()));
+                    break;
+                }
+            }
+        }
+
+        log::info!("[{}] ====== 流结束 ======", tag);
+
+        if let Some(c) = collector.take() {
+            c.finish().await;
+        }
+    }
+}

src-tauri/src/proxy/router.rs

@@ -1,70 +0,0 @@
-//! Provider路由器
-//!
-//! 负责选择合适的Provider进行请求转发
-
-use super::ProxyError;
-use crate::{app_config::AppType, database::Database, provider::Provider};
-use std::sync::Arc;
-
-pub struct ProviderRouter {
-    db: Arc<Database>,
-}
-
-impl ProviderRouter {
-    pub fn new(db: Arc<Database>) -> Self {
-        Self { db }
-    }
-
-    /// 选择Provider（只使用标记为代理目标的 Provider）
-    pub async fn select_provider(
-        &self,
-        app_type: &AppType,
-        _failed_ids: &[String],
-    ) -> Result<Provider, ProxyError> {
-        // 1. 获取 Proxy Target Provider ID
-        let proxy_target_id = self
-            .db
-            .get_proxy_target_provider(app_type.as_str())
-            .map_err(|e| ProxyError::DatabaseError(e.to_string()))?;
-
-        let target_id = proxy_target_id.ok_or_else(|| {
-            log::warn!("[{}] 未设置代理目标 Provider", app_type.as_str());
-            ProxyError::NoAvailableProvider
-        })?;
-
-        // 2. 获取所有 Provider
-        let providers = self
-            .db
-            .get_all_providers(app_type.as_str())
-            .map_err(|e| ProxyError::DatabaseError(e.to_string()))?;
-
-        // 3. 找到目标 Provider
-        let target = providers.get(&target_id).ok_or_else(|| {
-            log::warn!(
-                "[{}] 代理目标 Provider 不存在: {}",
-                app_type.as_str(),
-                target_id
-            );
-            ProxyError::NoAvailableProvider
-        })?;
-
-        log::info!(
-            "[{}] 使用代理目标 Provider: {}",
-            app_type.as_str(),
-            target.name
-        );
-        Ok(target.clone())
-    }
-
-    /// 更新Provider健康状态（保留接口但不影响选择）
-    #[allow(dead_code)]
-    pub async fn update_health(
-        &self,
-        _provider: &Provider,
-        _app_type: &AppType,
-        _success: bool,
-        _error_msg: Option<String>,
-    ) {
-        // 不再记录健康状态
-    }
-}

src-tauri/src/proxy/server.rs

@@ -2,7 +2,10 @@
 //!
 //! 基于Axum的HTTP服务器，处理代理请求
 
-use super::{handlers, types::*, ProxyError};
+use super::{
+    failover_switch::FailoverSwitchManager, handlers, provider_router::ProviderRouter, types::*,
+    ProxyError,
+};
 use crate::database::Database;
 use axum::{
     routing::{get, post},
@@ -11,6 +14,7 @@ use axum::{
 use std::net::SocketAddr;
 use std::sync::Arc;
 use tokio::sync::{oneshot, RwLock};
+use tokio::task::JoinHandle;
 use tower_http::cors::{Any, CorsLayer};
 
 /// 代理服务器状态（共享）
@@ -22,6 +26,12 @@ pub struct ProxyState {
     pub start_time: Arc<RwLock<Option<std::time::Instant>>>,
     /// 每个应用类型当前使用的 provider (app_type -> (provider_id, provider_name))
     pub current_providers: Arc<RwLock<std::collections::HashMap<String, (String, String)>>>,
+    /// 共享的 ProviderRouter（持有熔断器状态，跨请求保持）
+    pub provider_router: Arc<ProviderRouter>,
+    /// AppHandle，用于发射事件和更新托盘菜单
+    pub app_handle: Option<tauri::AppHandle>,
+    /// 故障转移切换管理器
+    pub failover_manager: Arc<FailoverSwitchManager>,
 }
 
 /// 代理HTTP服务器
@@ -29,22 +39,37 @@ pub struct ProxyServer {
     config: ProxyConfig,
     state: ProxyState,
     shutdown_tx: Arc<RwLock<Option<oneshot::Sender<()>>>>,
+    /// 服务器任务句柄，用于等待服务器实际关闭
+    server_handle: Arc<RwLock<Option<JoinHandle<()>>>>,
 }
 
 impl ProxyServer {
-    pub fn new(config: ProxyConfig, db: Arc<Database>) -> Self {
+    pub fn new(
+        config: ProxyConfig,
+        db: Arc<Database>,
+        app_handle: Option<tauri::AppHandle>,
+    ) -> Self {
+        // 创建共享的 ProviderRouter（熔断器状态将跨所有请求保持）
+        let provider_router = Arc::new(ProviderRouter::new(db.clone()));
+        // 创建故障转移切换管理器
+        let failover_manager = Arc::new(FailoverSwitchManager::new(db.clone()));
+
         let state = ProxyState {
             db,
             config: Arc::new(RwLock::new(config.clone())),
             status: Arc::new(RwLock::new(ProxyStatus::default())),
             start_time: Arc::new(RwLock::new(None)),
             current_providers: Arc::new(RwLock::new(std::collections::HashMap::new())),
+            provider_router,
+            app_handle,
+            failover_manager,
         };
 
         Self {
             config,
             state,
             shutdown_tx: Arc::new(RwLock::new(None)),
+            server_handle: Arc::new(RwLock::new(None)),
         }
     }
 
@@ -87,7 +112,7 @@ impl ProxyServer {
 
         // 启动服务器
         let state = self.state.clone();
-        tokio::spawn(async move {
+        let handle = tokio::spawn(async move {
             axum::serve(listener, app)
                 .with_graceful_shutdown(async {
                     shutdown_rx.await.ok();
@@ -100,6 +125,9 @@ impl ProxyServer {
             *state.start_time.write().await = None;
         });
 
+        // 保存服务器任务句柄
+        *self.server_handle.write().await = Some(handle);
+
         Ok(ProxyServerInfo {
             address: self.config.listen_address.clone(),
             port: self.config.listen_port,
@@ -108,12 +136,23 @@ impl ProxyServer {
     }
 
     pub async fn stop(&self) -> Result<(), ProxyError> {
+        // 1. 发送关闭信号
         if let Some(tx) = self.shutdown_tx.write().await.take() {
             let _ = tx.send(());
-            Ok(())
         } else {
-            Err(ProxyError::NotRunning)
+            return Err(ProxyError::NotRunning);
         }
+
+        // 2. 等待服务器任务结束（带 5 秒超时保护）
+        if let Some(handle) = self.server_handle.write().await.take() {
+            match tokio::time::timeout(std::time::Duration::from_secs(5), handle).await {
+                Ok(Ok(())) => log::info!("代理服务器已完全停止"),
+                Ok(Err(e)) => log::warn!("代理服务器任务异常终止: {e}"),
+                Err(_) => log::warn!("代理服务器停止超时（5秒），强制继续"),
+            }
+        }
+
+        Ok(())
     }
 
     pub async fn get_status(&self) -> ProxyStatus {
@@ -174,4 +213,22 @@ impl ProxyServer {
     pub async fn apply_runtime_config(&self, config: &ProxyConfig) {
         *self.state.config.write().await = config.clone();
     }
+
+    /// 热更新熔断器配置
+    ///
+    /// 将新配置应用到所有已创建的熔断器实例
+    pub async fn update_circuit_breaker_configs(
+        &self,
+        config: super::circuit_breaker::CircuitBreakerConfig,
+    ) {
+        self.state.provider_router.update_all_configs(config).await;
+    }
+
+    /// 重置指定 Provider 的熔断器
+    pub async fn reset_provider_circuit_breaker(&self, provider_id: &str, app_type: &str) {
+        self.state
+            .provider_router
+            .reset_provider_breaker(provider_id, app_type)
+            .await;
+    }
 }

src-tauri/src/services/provider/mod.rs

@@ -206,17 +206,27 @@ impl ProviderService {
                 id
             );
 
+            // 获取新供应商的完整配置（用于更新备份）
+            let provider = providers
+                .get(id)
+                .ok_or_else(|| AppError::Message(format!("供应商 {id} 不存在")))?;
+
             // Update database is_current
             state.db.set_current_provider(app_type.as_str(), id)?;
 
-            // 同时更新 is_proxy_target（代理路由器使用此字段选择供应商）
-            state.db.set_proxy_target_provider(app_type.as_str(), id)?;
-
             // Update local settings for consistency
             crate::settings::set_current_provider(&app_type, Some(id))?;
 
+            // 更新 Live 备份（确保代理关闭时恢复正确的供应商配置）
+            futures::executor::block_on(
+                state
+                    .proxy_service
+                    .update_live_backup_from_provider(app_type.as_str(), provider),
+            )
+            .map_err(|e| AppError::Message(format!("更新 Live 备份失败: {e}")))?;
+
             // Note: No Live config write, no MCP sync
-            // The proxy server will route requests to the new provider via is_proxy_target
+            // The proxy server will route requests to the new provider via is_current
             return Ok(());
         }
 
@@ -274,18 +284,6 @@ impl ProviderService {
         Ok(())
     }
 
-    /// Set proxy target provider
-    pub fn set_proxy_target(state: &AppState, app_type: AppType, id: &str) -> Result<(), AppError> {
-        // Check if provider exists
-        let providers = state.db.get_all_providers(app_type.as_str())?;
-        if !providers.contains_key(id) {
-            return Err(AppError::Message(format!("供应商 {id} 不存在")));
-        }
-
-        state.db.set_proxy_target_provider(app_type.as_str(), id)?;
-        Ok(())
-    }
-
     /// Sync current provider to live configuration (re-export)
     pub fn sync_current_to_live(state: &AppState) -> Result<(), AppError> {
         sync_current_to_live(state)

src-tauri/src/services/provider/usage.rs

@@ -79,6 +79,34 @@ pub(crate) async fn execute_and_format_usage_result(
     }
 }
 
+/// Extract API key from provider configuration
+fn extract_api_key_from_provider(provider: &crate::provider::Provider) -> Option<String> {
+    if let Some(env) = provider.settings_config.get("env") {
+        // Try multiple possible API key fields
+        env.get("ANTHROPIC_AUTH_TOKEN")
+            .or_else(|| env.get("ANTHROPIC_API_KEY"))
+            .or_else(|| env.get("OPENROUTER_API_KEY"))
+            .or_else(|| env.get("GOOGLE_API_KEY"))
+            .and_then(|v| v.as_str())
+            .map(|s| s.to_string())
+    } else {
+        None
+    }
+}
+
+/// Extract base URL from provider configuration
+fn extract_base_url_from_provider(provider: &crate::provider::Provider) -> Option<String> {
+    if let Some(env) = provider.settings_config.get("env") {
+        // Try multiple possible base URL fields
+        env.get("ANTHROPIC_BASE_URL")
+            .or_else(|| env.get("GOOGLE_GEMINI_BASE_URL"))
+            .and_then(|v| v.as_str())
+            .map(|s| s.trim_end_matches('/').to_string())
+    } else {
+        None
+    }
+}
+
 /// Query provider usage (using saved script configuration)
 pub async fn query_usage(
     state: &AppState,
@@ -114,12 +142,26 @@ pub async fn query_usage(
             ));
         }
 
-        // Get credentials directly from UsageScript, no longer extract from provider config
+        // Get credentials: prioritize UsageScript values, fallback to provider config
+        let api_key = usage_script
+            .api_key
+            .clone()
+            .filter(|k| !k.is_empty())
+            .or_else(|| extract_api_key_from_provider(provider))
+            .unwrap_or_default();
+
+        let base_url = usage_script
+            .base_url
+            .clone()
+            .filter(|u| !u.is_empty())
+            .or_else(|| extract_base_url_from_provider(provider))
+            .unwrap_or_default();
+
         (
             usage_script.code.clone(),
             usage_script.timeout.unwrap_or(10),
-            usage_script.api_key.clone().unwrap_or_default(),
-            usage_script.base_url.clone().unwrap_or_default(),
+            api_key,
+            base_url,
             usage_script.access_token.clone(),
             usage_script.user_id.clone(),
         )

src-tauri/src/services/proxy.rs

@@ -5,6 +5,7 @@
 use crate::app_config::AppType;
 use crate::config::{get_claude_settings_path, read_json_file, write_json_file};
 use crate::database::Database;
+use crate::provider::Provider;
 use crate::proxy::server::ProxyServer;
 use crate::proxy::types::*;
 use serde_json::{json, Value};
@@ -16,6 +17,8 @@ use tokio::sync::RwLock;
 pub struct ProxyService {
     db: Arc<Database>,
     server: Arc<RwLock<Option<ProxyServer>>>,
+    /// AppHandle，用于传递给 ProxyServer 以支持故障转移时的 UI 更新
+    app_handle: Arc<RwLock<Option<tauri::AppHandle>>>,
 }
 
 impl ProxyService {
@@ -23,9 +26,17 @@ impl ProxyService {
         Self {
             db,
             server: Arc::new(RwLock::new(None)),
+            app_handle: Arc::new(RwLock::new(None)),
         }
     }
 
+    /// 设置 AppHandle（在应用初始化时调用）
+    pub fn set_app_handle(&self, handle: tauri::AppHandle) {
+        futures::executor::block_on(async {
+            *self.app_handle.write().await = Some(handle);
+        });
+    }
+
     /// 启动代理服务器
     pub async fn start(&self) -> Result<ProxyServerInfo, String> {
         // 1. 获取配置
@@ -44,7 +55,8 @@ impl ProxyService {
         }
 
         // 4. 创建并启动服务器
-        let server = ProxyServer::new(config.clone(), self.db.clone());
+        let app_handle = self.app_handle.read().await.clone();
+        let server = ProxyServer::new(config.clone(), self.db.clone(), app_handle);
         let info = server
             .start()
             .await
@@ -65,25 +77,22 @@ impl ProxyService {
 
     /// 启动代理服务器（带 Live 配置接管）
     pub async fn start_with_takeover(&self) -> Result<ProxyServerInfo, String> {
-        // 1. 自动将各应用当前选中的供应商设置为代理目标
-        self.setup_proxy_targets().await?;
-
-        // 2. 备份各应用的 Live 配置
+        // 1. 备份各应用的 Live 配置
         self.backup_live_configs().await?;
 
-        // 3. 同步 Live 配置中的 Token 到数据库（确保代理能读到最新的 Token）
+        // 2. 同步 Live 配置中的 Token 到数据库（确保代理能读到最新的 Token）
         self.sync_live_to_providers().await?;
 
-        // 4. 接管各应用的 Live 配置（写入代理地址，清空 Token）
+        // 3. 接管各应用的 Live 配置（写入代理地址，清空 Token）
         self.takeover_live_configs().await?;
 
-        // 5. 设置接管状态
+        // 4. 设置接管状态
         self.db
             .set_live_takeover_active(true)
             .await
             .map_err(|e| format!("设置接管状态失败: {e}"))?;
 
-        // 6. 启动代理服务器
+        // 5. 启动代理服务器
         match self.start().await {
             Ok(info) => Ok(info),
             Err(e) => {
@@ -96,27 +105,6 @@ impl ProxyService {
         }
     }
 
-    /// 自动设置代理目标：将各应用当前选中的供应商设置为代理目标
-    async fn setup_proxy_targets(&self) -> Result<(), String> {
-        let app_types = ["claude", "codex", "gemini"];
-
-        for app_type in app_types {
-            // 获取当前选中的供应商
-            if let Ok(Some(provider_id)) = self.db.get_current_provider(app_type) {
-                // 设置为代理目标
-                if let Err(e) = self.db.set_proxy_target(&provider_id, app_type, true).await {
-                    log::warn!("设置 {app_type} 的代理目标 {provider_id} 失败: {e}");
-                } else {
-                    log::info!("已将 {app_type} 的当前供应商 {provider_id} 设置为代理目标");
-                }
-            } else {
-                log::debug!("{app_type} 没有当前供应商，跳过代理目标设置");
-            }
-        }
-
-        Ok(())
-    }
-
     /// 同步 Live 配置中的 Token 到数据库
     ///
     /// 在清空 Live Token 之前调用，确保数据库中的 Provider 配置有最新的 Token。
@@ -154,7 +142,8 @@ impl ProxyService {
                                     log::warn!("同步 Claude Token 到数据库失败: {e}");
                                 } else {
                                     log::info!(
-                                        "已同步 Claude Token 到数据库 (provider: {provider_id})"
+                                        "已同步 Claude Token 到数据库 (provider: {})",
+                                        provider_id
                                     );
                                 }
                             }
@@ -193,7 +182,8 @@ impl ProxyService {
                                     log::warn!("同步 Codex Token 到数据库失败: {e}");
                                 } else {
                                     log::info!(
-                                        "已同步 Codex Token 到数据库 (provider: {provider_id})"
+                                        "已同步 Codex Token 到数据库 (provider: {})",
+                                        provider_id
                                     );
                                 }
                             }
@@ -203,13 +193,13 @@ impl ProxyService {
             }
         }
 
-        // Gemini: 同步 GOOGLE_API_KEY
+        // Gemini: 同步 GEMINI_API_KEY
         if let Ok(live_config) = self.read_gemini_live() {
             if let Some(provider_id) = self.db.get_current_provider("gemini").ok().flatten() {
                 if let Ok(Some(mut provider)) = self.db.get_provider_by_id(&provider_id, "gemini") {
                     // 从 live 配置提取 token
                     if let Some(env) = live_config.get("env") {
-                        if let Some(token) = env.get("GOOGLE_API_KEY").and_then(|v| v.as_str()) {
+                        if let Some(token) = env.get("GEMINI_API_KEY").and_then(|v| v.as_str()) {
                             if !token.is_empty() {
                                 // 更新 provider 的 settings_config
                                 if let Some(env_obj) = provider
@@ -217,10 +207,10 @@ impl ProxyService {
                                     .get_mut("env")
                                     .and_then(|v| v.as_object_mut())
                                 {
-                                    env_obj.insert("GOOGLE_API_KEY".to_string(), json!(token));
+                                    env_obj.insert("GEMINI_API_KEY".to_string(), json!(token));
                                 } else {
                                     provider.settings_config["env"] = json!({
-                                        "GOOGLE_API_KEY": token
+                                        "GEMINI_API_KEY": token
                                     });
                                 }
                                 // 保存到数据库
@@ -232,7 +222,8 @@ impl ProxyService {
                                     log::warn!("同步 Gemini Token 到数据库失败: {e}");
                                 } else {
                                     log::info!(
-                                        "已同步 Gemini Token 到数据库 (provider: {provider_id})"
+                                        "已同步 Gemini Token 到数据库 (provider: {})",
+                                        provider_id
                                     );
                                 }
                             }
@@ -287,6 +278,12 @@ impl ProxyService {
             .await
             .map_err(|e| format!("删除备份失败: {e}"))?;
 
+        // 5. 重置健康状态（让健康徽章恢复为正常）
+        self.db
+            .clear_all_provider_health()
+            .await
+            .map_err(|e| format!("重置健康状态失败: {e}"))?;
+
         log::info!("代理已停止，Live 配置已恢复");
         Ok(())
     }
@@ -357,34 +354,42 @@ impl ProxyService {
                 });
             }
             self.write_claude_live(&live_config)?;
-            log::info!("Claude Live 配置已接管，代理地址: {proxy_url}");
+            log::info!("Claude Live 配置已接管，代理地址: {}", proxy_url);
         }
 
-        // Codex: 修改 OPENAI_BASE_URL，使用占位符替代真实 Token（代理会注入真实 Token）
+        // Codex: 修改 config.toml 的 base_url，auth.json 的 OPENAI_API_KEY（代理会注入真实 Token）
         if let Ok(mut live_config) = self.read_codex_live() {
+            // 1. 修改 auth.json 中的 OPENAI_API_KEY（使用占位符）
             if let Some(auth) = live_config.get_mut("auth").and_then(|v| v.as_object_mut()) {
-                auth.insert("OPENAI_BASE_URL".to_string(), json!(&proxy_url));
-                // 使用占位符，避免显示缺少 key 的警告
                 auth.insert("OPENAI_API_KEY".to_string(), json!("PROXY_MANAGED"));
             }
+
+            // 2. 修改 config.toml 中的 base_url
+            let config_str = live_config
+                .get("config")
+                .and_then(|v| v.as_str())
+                .unwrap_or("");
+            let updated_config = Self::update_toml_base_url(config_str, &proxy_url);
+            live_config["config"] = json!(updated_config);
+
             self.write_codex_live(&live_config)?;
-            log::info!("Codex Live 配置已接管，代理地址: {proxy_url}");
+            log::info!("Codex Live 配置已接管，代理地址: {}", proxy_url);
         }
 
-        // Gemini: 修改 GEMINI_API_BASE，使用占位符替代真实 Token（代理会注入真实 Token）
+        // Gemini: 修改 GOOGLE_GEMINI_BASE_URL，使用占位符替代真实 Token（代理会注入真实 Token）
         if let Ok(mut live_config) = self.read_gemini_live() {
             if let Some(env) = live_config.get_mut("env").and_then(|v| v.as_object_mut()) {
-                env.insert("GEMINI_API_BASE".to_string(), json!(&proxy_url));
+                env.insert("GOOGLE_GEMINI_BASE_URL".to_string(), json!(&proxy_url));
                 // 使用占位符，避免显示缺少 key 的警告
-                env.insert("GOOGLE_API_KEY".to_string(), json!("PROXY_MANAGED"));
+                env.insert("GEMINI_API_KEY".to_string(), json!("PROXY_MANAGED"));
             } else {
                 live_config["env"] = json!({
-                    "GEMINI_API_BASE": &proxy_url,
-                    "GOOGLE_API_KEY": "PROXY_MANAGED"
+                    "GOOGLE_GEMINI_BASE_URL": &proxy_url,
+                    "GEMINI_API_KEY": "PROXY_MANAGED"
                 });
             }
             self.write_gemini_live(&live_config)?;
-            log::info!("Gemini Live 配置已接管，代理地址: {proxy_url}");
+            log::info!("Gemini Live 配置已接管，代理地址: {}", proxy_url);
         }
 
         Ok(())
@@ -427,6 +432,73 @@ impl ProxyService {
             .map_err(|e| format!("检查接管状态失败: {e}"))
     }
 
+    /// 从异常退出中恢复（启动时调用）
+    ///
+    /// 检测到 live_takeover_active=true 但代理未运行时调用此方法。
+    /// 会恢复 Live 配置、清除接管标志、删除备份。
+    pub async fn recover_from_crash(&self) -> Result<(), String> {
+        // 1. 恢复 Live 配置
+        self.restore_live_configs().await?;
+
+        // 2. 清除接管标志
+        self.db
+            .set_live_takeover_active(false)
+            .await
+            .map_err(|e| format!("清除接管状态失败: {e}"))?;
+
+        // 3. 删除备份
+        self.db
+            .delete_all_live_backups()
+            .await
+            .map_err(|e| format!("删除备份失败: {e}"))?;
+
+        log::info!("已从异常退出中恢复 Live 配置");
+        Ok(())
+    }
+
+    /// 从供应商配置更新 Live 备份（用于代理模式下的热切换）
+    ///
+    /// 与 backup_live_configs() 不同，此方法从供应商的 settings_config 生成备份，
+    /// 而不是从 Live 文件读取（因为 Live 文件已被代理接管）。
+    pub async fn update_live_backup_from_provider(
+        &self,
+        app_type: &str,
+        provider: &Provider,
+    ) -> Result<(), String> {
+        let backup_json = match app_type {
+            "claude" => {
+                // Claude: settings_config 直接作为备份
+                serde_json::to_string(&provider.settings_config)
+                    .map_err(|e| format!("序列化 Claude 配置失败: {e}"))?
+            }
+            "codex" => {
+                // Codex: settings_config 包含 {"auth": ..., "config": ...}，直接使用
+                serde_json::to_string(&provider.settings_config)
+                    .map_err(|e| format!("序列化 Codex 配置失败: {e}"))?
+            }
+            "gemini" => {
+                // Gemini: 只提取 env 字段（与原始备份格式一致）
+                // proxy.rs 的 read_gemini_live() 返回 {"env": {...}}
+                let env_backup = if let Some(env) = provider.settings_config.get("env") {
+                    json!({ "env": env })
+                } else {
+                    json!({ "env": {} })
+                };
+                serde_json::to_string(&env_backup)
+                    .map_err(|e| format!("序列化 Gemini 配置失败: {e}"))?
+            }
+            _ => return Err(format!("未知的应用类型: {app_type}")),
+        };
+
+        self.db
+            .save_live_backup(app_type, &backup_json)
+            .await
+            .map_err(|e| format!("更新 {app_type} 备份失败: {e}"))?;
+
+        log::info!("已更新 {app_type} Live 备份（热切换）");
+        Ok(())
+    }
+
     /// 代理模式下切换供应商（热切换，不写 Live）
     pub async fn switch_proxy_target(
         &self,
@@ -441,12 +513,29 @@ impl ProxyService {
             .set_current_provider(app_type_enum.as_str(), provider_id)
             .map_err(|e| format!("更新当前供应商失败: {e}"))?;
 
-        log::info!("代理模式：已切换 {app_type} 的目标供应商为 {provider_id}");
+        log::info!(
+            "代理模式：已切换 {} 的目标供应商为 {}",
+            app_type,
+            provider_id
+        );
         Ok(())
     }
 
     // ==================== Live 配置读写辅助方法 ====================
 
+    /// 更新 TOML 字符串中的 base_url
+    fn update_toml_base_url(toml_str: &str, new_url: &str) -> String {
+        use toml_edit::DocumentMut;
+
+        let mut doc = toml_str
+            .parse::<DocumentMut>()
+            .unwrap_or_else(|_| DocumentMut::new());
+
+        doc["base_url"] = toml_edit::value(new_url);
+
+        doc.to_string()
+    }
+
     fn read_claude_live(&self) -> Result<Value, String> {
         let path = get_claude_settings_path();
         if !path.exists() {
@@ -582,7 +671,8 @@ impl ProxyService {
                     .map_err(|e| format!("重启前停止代理服务器失败: {e}"))?;
             }
 
-            let new_server = ProxyServer::new(new_config, self.db.clone());
+            let app_handle = self.app_handle.read().await.clone();
+            let new_server = ProxyServer::new(new_config, self.db.clone(), app_handle);
             new_server
                 .start()
                 .await
@@ -602,4 +692,41 @@ impl ProxyService {
     pub async fn is_running(&self) -> bool {
         self.server.read().await.is_some()
     }
+
+    /// 热更新熔断器配置
+    ///
+    /// 如果代理服务器正在运行，将新配置应用到所有已创建的熔断器实例
+    pub async fn update_circuit_breaker_configs(
+        &self,
+        config: crate::proxy::CircuitBreakerConfig,
+    ) -> Result<(), String> {
+        if let Some(server) = self.server.read().await.as_ref() {
+            server.update_circuit_breaker_configs(config).await;
+            log::info!("已热更新运行中的熔断器配置");
+        } else {
+            log::debug!("代理服务器未运行，熔断器配置将在下次启动时生效");
+        }
+        Ok(())
+    }
+
+    /// 重置指定 Provider 的熔断器
+    ///
+    /// 如果代理服务器正在运行，立即重置内存中的熔断器状态
+    pub async fn reset_provider_circuit_breaker(
+        &self,
+        provider_id: &str,
+        app_type: &str,
+    ) -> Result<(), String> {
+        if let Some(server) = self.server.read().await.as_ref() {
+            server
+                .reset_provider_circuit_breaker(provider_id, app_type)
+                .await;
+            log::info!(
+                "已重置 Provider {} (app: {}) 的熔断器",
+                provider_id,
+                app_type
+            );
+        }
+        Ok(())
+    }
 }

src-tauri/tests/deeplink_import.rs

@@ -1,6 +1,8 @@
 use std::sync::Arc;
 
-use cc_switch_lib::{import_provider_from_deeplink, parse_deeplink_url, AppState, Database};
+use cc_switch_lib::{
+    import_provider_from_deeplink, parse_deeplink_url, AppState, Database, ProxyService,
+};
 
 #[path = "support.rs"]
 mod support;
@@ -16,8 +18,11 @@ fn deeplink_import_claude_provider_persists_to_db() {
     let request = parse_deeplink_url(url).expect("parse deeplink url");
 
     let db = Arc::new(Database::memory().expect("create memory db"));
-
-    let state = AppState { db: db.clone() };
+    let proxy_service = ProxyService::new(db.clone());
+    let state = AppState {
+        db: db.clone(),
+        proxy_service,
+    };
 
     let provider_id = import_provider_from_deeplink(&state, request.clone())
         .expect("import provider from deeplink");
@@ -53,8 +58,11 @@ fn deeplink_import_codex_provider_builds_auth_and_config() {
     let request = parse_deeplink_url(url).expect("parse deeplink url");
 
     let db = Arc::new(Database::memory().expect("create memory db"));
-
-    let state = AppState { db: db.clone() };
+    let proxy_service = ProxyService::new(db.clone());
+    let state = AppState {
+        db: db.clone(),
+        proxy_service,
+    };
 
     let provider_id = import_provider_from_deeplink(&state, request.clone())
         .expect("import provider from deeplink");

src-tauri/tests/support.rs

@@ -1,7 +1,9 @@
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, Mutex, OnceLock};
 
-use cc_switch_lib::{update_settings, AppSettings, AppState, Database, MultiAppConfig};
+use cc_switch_lib::{
+    update_settings, AppSettings, AppState, Database, MultiAppConfig, ProxyService,
+};
 
 /// 为测试设置隔离的 HOME 目录，避免污染真实用户数据。
 pub fn ensure_test_home() -> &'static Path {
@@ -48,15 +50,17 @@ pub fn test_mutex() -> &'static Mutex<()> {
 
 /// 创建测试用的 AppState，包含一个空的数据库
 pub fn create_test_state() -> Result<AppState, Box<dyn std::error::Error>> {
-    let db = Database::init()?;
-    Ok(AppState { db: Arc::new(db) })
+    let db = Arc::new(Database::init()?);
+    let proxy_service = ProxyService::new(db.clone());
+    Ok(AppState { db, proxy_service })
 }
 
 /// 创建测试用的 AppState，并从 MultiAppConfig 迁移数据
 pub fn create_test_state_with_config(
     config: &MultiAppConfig,
 ) -> Result<AppState, Box<dyn std::error::Error>> {
-    let db = Database::init()?;
+    let db = Arc::new(Database::init()?);
     db.migrate_from_json(config)?;
-    Ok(AppState { db: Arc::new(db) })
+    let proxy_service = ProxyService::new(db.clone());
+    Ok(AppState { db, proxy_service })
 }

src/App.tsx

@@ -142,6 +142,7 @@ function App() {
         if (migrated) {
           toast.success(
             t("migration.success", { defaultValue: "配置迁移成功" }),
+            { closeButton: true },
           );
         }
       } catch (error) {

src/components/DeepLinkImportDialog.tsx

@@ -128,6 +128,7 @@ export function DeepLinkImportDialog() {
             description: t("deeplink.mcpImportSuccessDescription", {
               count: summary.importedCount,
             }),
+            closeButton: true,
           });
         }
       };
@@ -142,6 +143,7 @@ export function DeepLinkImportDialog() {
             description: t("deeplink.importSuccessDescription", {
               name: request.name,
             }),
+            closeButton: true,
           });
         } else if (result.type === "prompt") {
           // Prompts don't use React Query, trigger a custom event for refresh
@@ -154,6 +156,7 @@ export function DeepLinkImportDialog() {
             description: t("deeplink.promptImportSuccessDescription", {
               name: request.name,
             }),
+            closeButton: true,
           });
         } else if (result.type === "mcp") {
           await refreshMcp(result);
@@ -171,6 +174,7 @@ export function DeepLinkImportDialog() {
             description: t("deeplink.skillImportSuccessDescription", {
               repo: request.repo,
             }),
+            closeButton: true,
           });
         }
       } else if (isMcpImportResult(result)) {
@@ -185,6 +189,7 @@ export function DeepLinkImportDialog() {
           description: t("deeplink.importSuccessDescription", {
             name: request.name,
           }),
+          closeButton: true,
         });
       }
 
@@ -605,6 +610,86 @@ export function DeepLinkImportDialog() {
                     </div>
                   )}
 
+                  {/* Usage Script Configuration (v3.9+) */}
+                  {request.usageScript && (
+                    <div className="space-y-3 pt-2 border-t border-border-default">
+                      <div className="grid grid-cols-3 items-center gap-4">
+                        <div className="font-medium text-sm text-muted-foreground">
+                          {t("deeplink.usageScript", {
+                            defaultValue: "用量查询",
+                          })}
+                        </div>
+                        <div className="col-span-2 text-sm">
+                          <span
+                            className={`inline-flex items-center px-2 py-0.5 rounded-md text-xs font-medium ${
+                              request.usageEnabled !== false
+                                ? "bg-green-100 dark:bg-green-900/30 text-green-700 dark:text-green-300"
+                                : "bg-gray-100 dark:bg-gray-800 text-gray-600 dark:text-gray-400"
+                            }`}
+                          >
+                            {request.usageEnabled !== false
+                              ? t("deeplink.usageScriptEnabled", {
+                                  defaultValue: "已启用",
+                                })
+                              : t("deeplink.usageScriptDisabled", {
+                                  defaultValue: "未启用",
+                                })}
+                          </span>
+                        </div>
+                      </div>
+
+                      {/* Usage API Key (if different from provider) */}
+                      {request.usageApiKey &&
+                        request.usageApiKey !== request.apiKey && (
+                          <div className="grid grid-cols-3 items-center gap-4">
+                            <div className="font-medium text-sm text-muted-foreground">
+                              {t("deeplink.usageApiKey", {
+                                defaultValue: "用量 API Key",
+                              })}
+                            </div>
+                            <div className="col-span-2 text-sm font-mono text-muted-foreground">
+                              {request.usageApiKey.length > 4
+                                ? `${request.usageApiKey.substring(0, 4)}${"*".repeat(12)}`
+                                : "****"}
+                            </div>
+                          </div>
+                        )}
+
+                      {/* Usage Base URL (if different from provider) */}
+                      {request.usageBaseUrl &&
+                        request.usageBaseUrl !== request.endpoint && (
+                          <div className="grid grid-cols-3 items-center gap-4">
+                            <div className="font-medium text-sm text-muted-foreground">
+                              {t("deeplink.usageBaseUrl", {
+                                defaultValue: "用量查询地址",
+                              })}
+                            </div>
+                            <div className="col-span-2 text-sm break-all">
+                              {request.usageBaseUrl}
+                            </div>
+                          </div>
+                        )}
+
+                      {/* Auto Query Interval */}
+                      {request.usageAutoInterval &&
+                        request.usageAutoInterval > 0 && (
+                          <div className="grid grid-cols-3 items-center gap-4">
+                            <div className="font-medium text-sm text-muted-foreground">
+                              {t("deeplink.usageAutoInterval", {
+                                defaultValue: "自动查询",
+                              })}
+                            </div>
+                            <div className="col-span-2 text-sm">
+                              {t("deeplink.usageAutoIntervalValue", {
+                                defaultValue: "每 {{minutes}} 分钟",
+                                minutes: request.usageAutoInterval,
+                              })}
+                            </div>
+                          </div>
+                        )}
+                    </div>
+                  )}
+
                   {/* Warning */}
                   <div className="rounded-lg bg-yellow-50 dark:bg-yellow-900/20 p-3 text-sm text-yellow-800 dark:text-yellow-200">
                     {t("deeplink.warning")}

src/components/JsonEditor.tsx

@@ -234,7 +234,9 @@ const JsonEditor: React.FC<JsonEditorProps> = ({
     try {
       const formatted = formatJSON(currentValue);
       onChange(formatted);
-      toast.success(t("common.formatSuccess", { defaultValue: "格式化成功" }));
+      toast.success(t("common.formatSuccess", { defaultValue: "格式化成功" }), {
+        closeButton: true,
+      });
     } catch (error) {
       const errorMessage =
         error instanceof Error ? error.message : String(error);

src/components/UsageScriptModal.tsx

@@ -227,6 +227,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
           .join(", ");
         toast.success(`${t("usageScript.testSuccess")}${summary}`, {
           duration: 3000,
+          closeButton: true,
         });
       } else {
         toast.error(
@@ -259,7 +260,10 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
         printWidth: 80,
       });
       setScript({ ...script, code: formatted.trim() });
-      toast.success(t("usageScript.formatSuccess"), { duration: 1000 });
+      toast.success(t("usageScript.formatSuccess"), {
+        duration: 1000,
+        closeButton: true,
+      });
     } catch (error: any) {
       toast.error(
         `${t("usageScript.formatFailed")}: ${error?.message || t("jsonEditor.invalidJson")}`,
@@ -400,15 +404,25 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
             {/* 凭证配置 */}
             {shouldShowCredentialsConfig && (
               <div className="space-y-4">
-                <h4 className="text-sm font-medium text-foreground">
-                  {t("usageScript.credentialsConfig")}
-                </h4>
+                <div className="flex items-start justify-between">
+                  <h4 className="text-sm font-medium text-foreground">
+                    {t("usageScript.credentialsConfig")}
+                  </h4>
+                  <p className="text-xs text-muted-foreground">
+                    {t("usageScript.credentialsHint")}
+                  </p>
+                </div>
 
                 <div className="grid gap-4 md:grid-cols-2">
                   {selectedTemplate === TEMPLATE_KEYS.GENERAL && (
                     <>
                       <div className="space-y-2">
-                        <Label htmlFor="usage-api-key">API Key</Label>
+                        <Label htmlFor="usage-api-key">
+                          API Key{" "}
+                          <span className="text-xs text-muted-foreground font-normal">
+                            ({t("usageScript.optional")})
+                          </span>
+                        </Label>
                         <div className="relative">
                           <Input
                             id="usage-api-key"
@@ -417,7 +431,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
                             onChange={(e) =>
                               setScript({ ...script, apiKey: e.target.value })
                             }
-                            placeholder="sk-xxxxx"
+                            placeholder={t("usageScript.apiKeyPlaceholder")}
                             autoComplete="off"
                             className="border-white/10"
                           />
@@ -444,7 +458,10 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
 
                       <div className="space-y-2">
                         <Label htmlFor="usage-base-url">
-                          {t("usageScript.baseUrl")}
+                          {t("usageScript.baseUrl")}{" "}
+                          <span className="text-xs text-muted-foreground font-normal">
+                            ({t("usageScript.optional")})
+                          </span>
                         </Label>
                         <Input
                           id="usage-base-url"
@@ -453,7 +470,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
                           onChange={(e) =>
                             setScript({ ...script, baseUrl: e.target.value })
                           }
-                          placeholder="https://api.example.com"
+                          placeholder={t("usageScript.baseUrlPlaceholder")}
                           autoComplete="off"
                           className="border-white/10"
                         />

src/components/env/EnvWarningBanner.tsx

@@ -79,6 +79,7 @@ export function EnvWarningBanner({
           path: backupInfo.backupPath,
         }),
         duration: 5000,
+        closeButton: true,
       });
 
       // 清空选择并通知父组件

src/components/mcp/McpFormModal.tsx

@@ -391,7 +391,7 @@ const McpFormModal: React.FC<McpFormModalProps> = ({
       }
 
       await upsertMutation.mutateAsync(entry);
-      toast.success(t("common.success"));
+      toast.success(t("common.success"), { closeButton: true });
       await onSave();
     } catch (error: any) {
       const detail = extractErrorMessage(error);

src/components/mcp/UnifiedMcpPanel.tsx

@@ -99,7 +99,7 @@ const UnifiedMcpPanel = React.forwardRef<
         try {
           await deleteServerMutation.mutateAsync(id);
           setConfirmDialog(null);
-          toast.success(t("common.success"));
+          toast.success(t("common.success"), { closeButton: true });
         } catch (error) {
           toast.error(t("common.error"), {
             description: String(error),

src/components/providers/ProviderActions.tsx

@@ -7,7 +7,6 @@ import {
   Play,
   TestTube2,
   Trash2,
-  // RotateCcw, // TODO: 暂时注释，等待故障转移功能启用
 } from "lucide-react";
 import { useTranslation } from "react-i18next";
 import { Button } from "@/components/ui/button";
@@ -23,9 +22,6 @@ interface ProviderActionsProps {
   onTest?: () => void;
   onConfigureUsage: () => void;
   onDelete: () => void;
-  onResetCircuitBreaker?: () => void;
-  isProxyTarget?: boolean;
-  consecutiveFailures?: number;
 }
 
 export function ProviderActions({
@@ -38,9 +34,6 @@ export function ProviderActions({
   onTest,
   onConfigureUsage,
   onDelete,
-  onResetCircuitBreaker: _onResetCircuitBreaker, // 暂未使用，前缀 _ 避免 lint 警告
-  isProxyTarget: _isProxyTarget, // 暂未使用，前缀 _ 避免 lint 警告
-  consecutiveFailures: _consecutiveFailures = 0, // 暂未使用，前缀 _ 避免 lint 警告
 }: ProviderActionsProps) {
   const { t } = useTranslation();
   const iconButtonClass = "h-8 w-8 p-1";
@@ -123,33 +116,6 @@ export function ProviderActions({
           <BarChart3 className="h-4 w-4" />
         </Button>
 
-        {/* 重置熔断器按钮 - 代理目标启用时显示 */}
-        {/* TODO: 暂时隐藏，后续根据故障转移功能启用 */}
-        {/* {onResetCircuitBreaker && isProxyTarget && (
-          <Button
-            size="icon"
-            variant="ghost"
-            onClick={onResetCircuitBreaker}
-            disabled={consecutiveFailures === 0}
-            title={
-              consecutiveFailures > 0
-                ? t("provider.resetCircuitBreaker", {
-                    defaultValue: "重置熔断器",
-                  })
-                : t("provider.noFailures", {
-                    defaultValue: "当前无失败记录",
-                  })
-            }
-            className={cn(
-              iconButtonClass,
-              consecutiveFailures > 0 &&
-                "hover:text-orange-500 dark:hover:text-orange-400",
-            )}
-          >
-            <RotateCcw className="h-4 w-4" />
-          </Button>
-        )} */}
-
         <Button
           size="icon"
           variant="ghost"

src/components/providers/ProviderCard.tsx

@@ -1,5 +1,5 @@
-import { useMemo } from "react";
-import { GripVertical } from "lucide-react";
+import { useMemo, useState, useEffect } from "react";
+import { GripVertical, ChevronDown, ChevronUp } from "lucide-react";
 import { useTranslation } from "react-i18next";
 import type {
   DraggableAttributes,
@@ -12,11 +12,8 @@ import { ProviderActions } from "@/components/providers/ProviderActions";
 import { ProviderIcon } from "@/components/ProviderIcon";
 import UsageFooter from "@/components/UsageFooter";
 import { ProviderHealthBadge } from "@/components/providers/ProviderHealthBadge";
-import {
-  useProviderHealth,
-  useResetCircuitBreaker,
-} from "@/lib/query/failover";
-import { toast } from "sonner";
+import { useProviderHealth } from "@/lib/query/failover";
+import { useUsageQuery } from "@/lib/query/queries";
 
 interface DragHandleProps {
   attributes: DraggableAttributes;
@@ -97,31 +94,6 @@ export function ProviderCard({
   // 获取供应商健康状态
   const { data: health } = useProviderHealth(provider.id, appId);
 
-  // 重置熔断器
-  const resetCircuitBreaker = useResetCircuitBreaker();
-
-  const handleResetCircuitBreaker = async () => {
-    try {
-      await resetCircuitBreaker.mutateAsync({
-        providerId: provider.id,
-        appType: appId,
-      });
-      toast.success(
-        t("provider.circuitBreakerReset", {
-          defaultValue: "熔断器已重置",
-        }),
-      );
-    } catch (error) {
-      toast.error(
-        t("provider.circuitBreakerResetFailed", {
-          defaultValue: "重置失败",
-        }) +
-          ": " +
-          String(error),
-      );
-    }
-  };
-
   const fallbackUrlText = t("provider.notConfigured", {
     defaultValue: "未配置接口地址",
   });
@@ -146,6 +118,29 @@ export function ProviderCard({
 
   const usageEnabled = provider.meta?.usage_script?.enabled ?? false;
 
+  // 获取用量数据以判断是否有多套餐
+  const autoQueryInterval = isCurrent
+    ? provider.meta?.usage_script?.autoQueryInterval || 0
+    : 0;
+
+  const { data: usage } = useUsageQuery(provider.id, appId, {
+    enabled: usageEnabled,
+    autoQueryInterval,
+  });
+
+  const hasMultiplePlans =
+    usage?.success && usage.data && usage.data.length > 1;
+
+  // 多套餐默认展开
+  const [isExpanded, setIsExpanded] = useState(false);
+
+  // 当检测到多套餐时自动展开
+  useEffect(() => {
+    if (hasMultiplePlans) {
+      setIsExpanded(true);
+    }
+  }, [hasMultiplePlans]);
+
   const handleOpenWebsite = () => {
     if (!isClickableUrl) {
       return;
@@ -209,7 +204,7 @@ export function ProviderCard({
           </div>
 
           <div className="space-y-1">
-            <div className="flex flex-wrap items-center gap-2 min-h-[20px]">
+            <div className="flex flex-wrap items-center gap-2 min-h-7">
               <h3 className="text-base font-semibold leading-none">
                 {provider.name}
               </h3>
@@ -253,19 +248,56 @@ export function ProviderCard({
           </div>
         </div>
 
-        <div className="relative flex items-center ml-auto">
-          <div className="ml-auto transition-transform duration-300 ease-out group-hover:-translate-x-[14.5rem] group-focus-within:-translate-x-[14.5rem] sm:group-hover:-translate-x-[16.5rem] sm:group-focus-within:-translate-x-[16.5rem]">
-            <UsageFooter
-              provider={provider}
-              providerId={provider.id}
-              appId={appId}
-              usageEnabled={usageEnabled}
-              isCurrent={isCurrent}
-              inline={true}
-            />
+        <div className="relative flex items-center ml-auto min-w-0">
+          {/* 用量信息区域 - hover 时向左移动，为操作按钮腾出空间 */}
+          <div className="ml-auto transition-transform duration-200 group-hover:-translate-x-[14.5rem] group-focus-within:-translate-x-[14.5rem] sm:group-hover:-translate-x-[16rem] sm:group-focus-within:-translate-x-[16rem]">
+            <div className="flex items-center gap-1">
+              {/* 多套餐时显示套餐数量，单套餐时显示详细信息 */}
+              {hasMultiplePlans ? (
+                <div className="flex items-center gap-2 text-xs text-gray-600 dark:text-gray-400">
+                  <span className="font-medium">
+                    {t("usage.multiplePlans", {
+                      count: usage?.data?.length || 0,
+                      defaultValue: `${usage?.data?.length || 0} 个套餐`,
+                    })}
+                  </span>
+                </div>
+              ) : (
+                <UsageFooter
+                  provider={provider}
+                  providerId={provider.id}
+                  appId={appId}
+                  usageEnabled={usageEnabled}
+                  isCurrent={isCurrent}
+                  inline={true}
+                />
+              )}
+              {/* 展开/折叠按钮 - 仅在有多套餐时显示 */}
+              {hasMultiplePlans && (
+                <button
+                  onClick={(e) => {
+                    e.stopPropagation();
+                    setIsExpanded(!isExpanded);
+                  }}
+                  className="p-1 rounded hover:bg-gray-100 dark:hover:bg-gray-800 transition-colors text-gray-500 dark:text-gray-400 flex-shrink-0"
+                  title={
+                    isExpanded
+                      ? t("usage.collapse", { defaultValue: "收起" })
+                      : t("usage.expand", { defaultValue: "展开" })
+                  }
+                >
+                  {isExpanded ? (
+                    <ChevronUp size={14} />
+                  ) : (
+                    <ChevronDown size={14} />
+                  )}
+                </button>
+              )}
+            </div>
           </div>
 
-          <div className="absolute right-0 top-1/2 -translate-y-1/2 flex items-center gap-1.5 opacity-0 pointer-events-none group-hover:opacity-100 group-focus-within:opacity-100 group-hover:pointer-events-auto group-focus-within:pointer-events-auto transition-all duration-300 ease-out translate-x-2 group-hover:translate-x-0 group-focus-within:translate-x-0">
+          {/* 操作按钮区域 - 绝对定位在右侧，hover 时滑入 */}
+          <div className="absolute right-0 top-1/2 -translate-y-1/2 flex items-center gap-1.5 opacity-0 pointer-events-none group-hover:opacity-100 group-focus-within:opacity-100 group-hover:pointer-events-auto group-focus-within:pointer-events-auto transition-all duration-200 translate-x-2 group-hover:translate-x-0 group-focus-within:translate-x-0">
             <ProviderActions
               isCurrent={isCurrent}
               isTesting={isTesting}
@@ -276,17 +308,24 @@ export function ProviderCard({
               onTest={onTest ? () => onTest(provider) : undefined}
               onConfigureUsage={() => onConfigureUsage(provider)}
               onDelete={() => onDelete(provider)}
-              onResetCircuitBreaker={
-                isProxyRunning && provider.isProxyTarget
-                  ? handleResetCircuitBreaker
-                  : undefined
-              }
-              isProxyTarget={provider.isProxyTarget}
-              consecutiveFailures={health?.consecutive_failures ?? 0}
             />
           </div>
         </div>
       </div>
+
+      {/* 展开的完整套餐列表 */}
+      {isExpanded && hasMultiplePlans && (
+        <div className="mt-4 pt-4 border-t border-border-default">
+          <UsageFooter
+            provider={provider}
+            providerId={provider.id}
+            appId={appId}
+            usageEnabled={usageEnabled}
+            isCurrent={isCurrent}
+            inline={false}
+          />
+        </div>
+      )}
     </div>
   );
 }

src/components/proxy/AutoFailoverConfigPanel.tsx

@@ -54,6 +54,7 @@ export function AutoFailoverConfigPanel({
       });
       toast.success(
         t("proxy.autoFailover.configSaved", "自动故障转移配置已保存"),
+        { closeButton: true },
       );
     } catch (e) {
       toast.error(
@@ -100,7 +101,7 @@ export function AutoFailoverConfigPanel({
           <AlertDescription className="text-sm">
             {t(
               "proxy.autoFailover.info",
-              "当启用多个代理目标时，系统会按优先级顺序依次尝试。当某个供应商连续失败达到阈值时，熔断器会自动打开，跳过该供应商。",
+              "当故障转移队列中配置了多个供应商时，系统会在请求失败时按优先级顺序依次尝试。当某个供应商连续失败达到阈值时，熔断器会打开并在一段时间内跳过该供应商。",
             )}
           </AlertDescription>
         </Alert>

src/components/proxy/CircuitBreakerConfigPanel.tsx

@@ -34,7 +34,7 @@ export function CircuitBreakerConfigPanel() {
   const handleSave = async () => {
     try {
       await updateConfig.mutateAsync(formData);
-      toast.success("熔断器配置已保存");
+      toast.success("熔断器配置已保存", { closeButton: true });
     } catch (error) {
       toast.error("保存失败: " + String(error));
     }

src/components/proxy/FailoverQueueManager.tsx

@@ -0,0 +1,414 @@
+/**
+ * 故障转移队列管理组件
+ *
+ * 允许用户管理代理模式下的故障转移队列，支持：
+ * - 拖拽排序
+ * - 添加/移除供应商
+ * - 启用/禁用队列项
+ */
+
+import { useState, useCallback, useMemo } from "react";
+import { useTranslation } from "react-i18next";
+import { CSS } from "@dnd-kit/utilities";
+import { DndContext, closestCenter } from "@dnd-kit/core";
+import {
+  SortableContext,
+  useSortable,
+  verticalListSortingStrategy,
+} from "@dnd-kit/sortable";
+import {
+  KeyboardSensor,
+  PointerSensor,
+  useSensor,
+  useSensors,
+  type DragEndEvent,
+} from "@dnd-kit/core";
+import { arrayMove, sortableKeyboardCoordinates } from "@dnd-kit/sortable";
+import { toast } from "sonner";
+import {
+  GripVertical,
+  Plus,
+  Trash2,
+  Loader2,
+  Info,
+  AlertTriangle,
+} from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Switch } from "@/components/ui/switch";
+import { Alert, AlertDescription } from "@/components/ui/alert";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { cn } from "@/lib/utils";
+import type { FailoverQueueItem } from "@/types/proxy";
+import type { AppId } from "@/lib/api";
+import {
+  useFailoverQueue,
+  useAvailableProvidersForFailover,
+  useAddToFailoverQueue,
+  useRemoveFromFailoverQueue,
+  useReorderFailoverQueue,
+  useSetFailoverItemEnabled,
+} from "@/lib/query/failover";
+
+interface FailoverQueueManagerProps {
+  appType: AppId;
+  disabled?: boolean;
+}
+
+export function FailoverQueueManager({
+  appType,
+  disabled = false,
+}: FailoverQueueManagerProps) {
+  const { t } = useTranslation();
+  const [selectedProviderId, setSelectedProviderId] = useState<string>("");
+
+  // 查询数据
+  const {
+    data: queue,
+    isLoading: isQueueLoading,
+    error: queueError,
+  } = useFailoverQueue(appType);
+  const { data: availableProviders, isLoading: isProvidersLoading } =
+    useAvailableProvidersForFailover(appType);
+
+  // Mutations
+  const addToQueue = useAddToFailoverQueue();
+  const removeFromQueue = useRemoveFromFailoverQueue();
+  const reorderQueue = useReorderFailoverQueue();
+  const setItemEnabled = useSetFailoverItemEnabled();
+
+  // 拖拽配置
+  const sensors = useSensors(
+    useSensor(PointerSensor, {
+      activationConstraint: { distance: 8 },
+    }),
+    useSensor(KeyboardSensor, {
+      coordinateGetter: sortableKeyboardCoordinates,
+    }),
+  );
+
+  // 排序后的队列
+  const sortedQueue = useMemo(() => {
+    if (!queue) return [];
+    return [...queue].sort((a, b) => a.queueOrder - b.queueOrder);
+  }, [queue]);
+
+  // 处理拖拽结束
+  const handleDragEnd = useCallback(
+    async (event: DragEndEvent) => {
+      const { active, over } = event;
+      if (!over || active.id === over.id || !sortedQueue) return;
+
+      const oldIndex = sortedQueue.findIndex(
+        (item) => item.providerId === active.id,
+      );
+      const newIndex = sortedQueue.findIndex(
+        (item) => item.providerId === over.id,
+      );
+
+      if (oldIndex === -1 || newIndex === -1) return;
+
+      const reordered = arrayMove(sortedQueue, oldIndex, newIndex);
+      const providerIds = reordered.map((item) => item.providerId);
+
+      try {
+        await reorderQueue.mutateAsync({ appType, providerIds });
+        toast.success(
+          t("proxy.failoverQueue.reorderSuccess", "队列顺序已更新"),
+          { closeButton: true },
+        );
+      } catch (error) {
+        toast.error(
+          t("proxy.failoverQueue.reorderFailed", "更新顺序失败") +
+            ": " +
+            String(error),
+        );
+      }
+    },
+    [sortedQueue, appType, reorderQueue, t],
+  );
+
+  // 添加供应商到队列
+  const handleAddProvider = async () => {
+    if (!selectedProviderId) return;
+
+    try {
+      await addToQueue.mutateAsync({
+        appType,
+        providerId: selectedProviderId,
+      });
+      setSelectedProviderId("");
+      toast.success(
+        t("proxy.failoverQueue.addSuccess", "已添加到故障转移队列"),
+        { closeButton: true },
+      );
+    } catch (error) {
+      toast.error(
+        t("proxy.failoverQueue.addFailed", "添加失败") + ": " + String(error),
+      );
+    }
+  };
+
+  // 从队列移除供应商
+  const handleRemoveProvider = async (providerId: string) => {
+    try {
+      await removeFromQueue.mutateAsync({ appType, providerId });
+      toast.success(
+        t("proxy.failoverQueue.removeSuccess", "已从故障转移队列移除"),
+        { closeButton: true },
+      );
+    } catch (error) {
+      toast.error(
+        t("proxy.failoverQueue.removeFailed", "移除失败") +
+          ": " +
+          String(error),
+      );
+    }
+  };
+
+  // 切换启用状态
+  const handleToggleEnabled = async (providerId: string, enabled: boolean) => {
+    try {
+      await setItemEnabled.mutateAsync({ appType, providerId, enabled });
+    } catch (error) {
+      toast.error(
+        t("proxy.failoverQueue.toggleFailed", "状态更新失败") +
+          ": " +
+          String(error),
+      );
+    }
+  };
+
+  if (isQueueLoading) {
+    return (
+      <div className="flex items-center justify-center p-8">
+        <Loader2 className="h-6 w-6 animate-spin text-muted-foreground" />
+      </div>
+    );
+  }
+
+  if (queueError) {
+    return (
+      <Alert variant="destructive">
+        <AlertTriangle className="h-4 w-4" />
+        <AlertDescription>{String(queueError)}</AlertDescription>
+      </Alert>
+    );
+  }
+
+  return (
+    <div className="space-y-4">
+      {/* 说明信息 */}
+      <Alert className="border-blue-500/40 bg-blue-500/10">
+        <Info className="h-4 w-4" />
+        <AlertDescription className="text-sm">
+          {t(
+            "proxy.failoverQueue.info",
+            "当前激活的供应商始终优先。当请求失败时，系统会按队列顺序依次尝试其他供应商。",
+          )}
+        </AlertDescription>
+      </Alert>
+
+      {/* 添加供应商 */}
+      <div className="flex items-center gap-2">
+        <Select
+          value={selectedProviderId}
+          onValueChange={setSelectedProviderId}
+          disabled={disabled || isProvidersLoading}
+        >
+          <SelectTrigger className="flex-1">
+            <SelectValue
+              placeholder={t(
+                "proxy.failoverQueue.selectProvider",
+                "选择供应商添加到队列",
+              )}
+            />
+          </SelectTrigger>
+          <SelectContent>
+            {availableProviders?.map((provider) => (
+              <SelectItem key={provider.id} value={provider.id}>
+                {provider.name}
+              </SelectItem>
+            ))}
+            {(!availableProviders || availableProviders.length === 0) && (
+              <div className="px-2 py-4 text-center text-sm text-muted-foreground">
+                {t(
+                  "proxy.failoverQueue.noAvailableProviders",
+                  "没有可添加的供应商",
+                )}
+              </div>
+            )}
+          </SelectContent>
+        </Select>
+        <Button
+          onClick={handleAddProvider}
+          disabled={disabled || !selectedProviderId || addToQueue.isPending}
+          size="icon"
+          variant="outline"
+        >
+          {addToQueue.isPending ? (
+            <Loader2 className="h-4 w-4 animate-spin" />
+          ) : (
+            <Plus className="h-4 w-4" />
+          )}
+        </Button>
+      </div>
+
+      {/* 队列列表 */}
+      {sortedQueue.length === 0 ? (
+        <div className="rounded-lg border border-dashed border-muted-foreground/40 p-8 text-center">
+          <p className="text-sm text-muted-foreground">
+            {t(
+              "proxy.failoverQueue.empty",
+              "故障转移队列为空。添加供应商以启用自动故障转移。",
+            )}
+          </p>
+        </div>
+      ) : (
+        <DndContext
+          sensors={sensors}
+          collisionDetection={closestCenter}
+          onDragEnd={handleDragEnd}
+        >
+          <SortableContext
+            items={sortedQueue.map((item) => item.providerId)}
+            strategy={verticalListSortingStrategy}
+          >
+            <div className="space-y-2">
+              {sortedQueue.map((item, index) => (
+                <SortableQueueItem
+                  key={item.providerId}
+                  item={item}
+                  index={index}
+                  disabled={disabled}
+                  onToggleEnabled={handleToggleEnabled}
+                  onRemove={handleRemoveProvider}
+                  isRemoving={removeFromQueue.isPending}
+                  isToggling={setItemEnabled.isPending}
+                />
+              ))}
+            </div>
+          </SortableContext>
+        </DndContext>
+      )}
+
+      {/* 队列说明 */}
+      {sortedQueue.length > 0 && (
+        <p className="text-xs text-muted-foreground">
+          {t(
+            "proxy.failoverQueue.dragHint",
+            "拖拽供应商可调整故障转移顺序，序号越小优先级越高。",
+          )}
+        </p>
+      )}
+    </div>
+  );
+}
+
+interface SortableQueueItemProps {
+  item: FailoverQueueItem;
+  index: number;
+  disabled: boolean;
+  onToggleEnabled: (providerId: string, enabled: boolean) => void;
+  onRemove: (providerId: string) => void;
+  isRemoving: boolean;
+  isToggling: boolean;
+}
+
+function SortableQueueItem({
+  item,
+  index,
+  disabled,
+  onToggleEnabled,
+  onRemove,
+  isRemoving,
+  isToggling,
+}: SortableQueueItemProps) {
+  const { t } = useTranslation();
+  const {
+    setNodeRef,
+    attributes,
+    listeners,
+    transform,
+    transition,
+    isDragging,
+  } = useSortable({ id: item.providerId, disabled });
+
+  const style = {
+    transform: CSS.Transform.toString(transform),
+    transition,
+  };
+
+  return (
+    <div
+      ref={setNodeRef}
+      style={style}
+      className={cn(
+        "flex items-center gap-3 rounded-lg border bg-card p-3 transition-colors",
+        isDragging && "opacity-50 shadow-lg",
+        !item.enabled && "opacity-60",
+      )}
+    >
+      {/* 拖拽手柄 */}
+      <button
+        type="button"
+        className={cn(
+          "cursor-grab touch-none text-muted-foreground hover:text-foreground",
+          disabled && "cursor-not-allowed opacity-50",
+        )}
+        {...attributes}
+        {...listeners}
+        disabled={disabled}
+        aria-label={t("provider.dragHandle", "拖拽排序")}
+      >
+        <GripVertical className="h-5 w-5" />
+      </button>
+
+      {/* 序号 */}
+      <div className="flex h-6 w-6 items-center justify-center rounded-full bg-muted text-xs font-medium">
+        {index + 1}
+      </div>
+
+      {/* 供应商名称 */}
+      <div className="flex-1 min-w-0">
+        <span
+          className={cn(
+            "text-sm font-medium truncate block",
+            !item.enabled && "text-muted-foreground line-through",
+          )}
+        >
+          {item.providerName}
+        </span>
+      </div>
+
+      {/* 启用开关 */}
+      <Switch
+        checked={item.enabled}
+        onCheckedChange={(checked) => onToggleEnabled(item.providerId, checked)}
+        disabled={disabled || isToggling}
+        aria-label={t("proxy.failoverQueue.toggleEnabled", "启用/禁用")}
+      />
+
+      {/* 删除按钮 */}
+      <Button
+        variant="ghost"
+        size="icon"
+        className="h-8 w-8 text-muted-foreground hover:text-destructive"
+        onClick={() => onRemove(item.providerId)}
+        disabled={disabled || isRemoving}
+        aria-label={t("common.delete", "删除")}
+      >
+        {isRemoving ? (
+          <Loader2 className="h-4 w-4 animate-spin" />
+        ) : (
+          <Trash2 className="h-4 w-4" />
+        )}
+      </Button>
+    </div>
+  );
+}

src/components/proxy/ProxyPanel.tsx

@@ -11,7 +11,7 @@ import { Button } from "@/components/ui/button";
 import { useProxyStatus } from "@/hooks/useProxyStatus";
 import { ProxySettingsDialog } from "./ProxySettingsDialog";
 import { toast } from "sonner";
-import { useProxyTargets } from "@/lib/query/failover";
+import { useFailoverQueue } from "@/lib/query/failover";
 import { ProviderHealthBadge } from "@/components/providers/ProviderHealthBadge";
 import { useProviderHealth } from "@/lib/query/failover";
 import type { ProxyStatus } from "@/types/proxy";
@@ -20,10 +20,11 @@ export function ProxyPanel() {
   const { status, isRunning } = useProxyStatus();
   const [showSettings, setShowSettings] = useState(false);
 
-  // 获取所有三个应用类型的代理目标列表
-  const { data: claudeTargets = [] } = useProxyTargets("claude");
-  const { data: codexTargets = [] } = useProxyTargets("codex");
-  const { data: geminiTargets = [] } = useProxyTargets("gemini");
+  // 获取所有三个应用类型的故障转移队列（不包含当前供应商）
+  // 当前供应商始终优先，队列仅用于失败后的备用顺序
+  const { data: claudeQueue = [] } = useFailoverQueue("claude");
+  const { data: codexQueue = [] } = useFailoverQueue("codex");
+  const { data: geminiQueue = [] } = useFailoverQueue("gemini");
 
   const formatUptime = (seconds: number): string => {
     const hours = Math.floor(seconds / 3600);
@@ -69,7 +70,7 @@ export function ProxyPanel() {
                       navigator.clipboard.writeText(
                         `http://${status.address}:${status.port}`,
                       );
-                      toast.success("地址已复制");
+                      toast.success("地址已复制", { closeButton: true });
                     }}
                   >
                     复制
@@ -113,9 +114,9 @@ export function ProxyPanel() {
               </div>
 
               {/* 供应商队列 - 按应用类型分组展示 */}
-              {(claudeTargets.length > 0 ||
-                codexTargets.length > 0 ||
-                geminiTargets.length > 0) && (
+              {(claudeQueue.length > 0 ||
+                codexQueue.length > 0 ||
+                geminiQueue.length > 0) && (
                 <div className="pt-3 border-t border-border space-y-3">
                   <div className="flex items-center gap-2">
                     <ListOrdered className="h-3.5 w-3.5 text-muted-foreground" />
@@ -125,31 +126,49 @@ export function ProxyPanel() {
                   </div>
 
                   {/* Claude 队列 */}
-                  {claudeTargets.length > 0 && (
+                  {claudeQueue.length > 0 && (
                     <ProviderQueueGroup
                       appType="claude"
                       appLabel="Claude"
-                      targets={claudeTargets}
+                      targets={claudeQueue
+                        .filter((item) => item.enabled)
+                        .sort((a, b) => a.queueOrder - b.queueOrder)
+                        .map((item) => ({
+                          id: item.providerId,
+                          name: item.providerName,
+                        }))}
                       status={status}
                     />
                   )}
 
                   {/* Codex 队列 */}
-                  {codexTargets.length > 0 && (
+                  {codexQueue.length > 0 && (
                     <ProviderQueueGroup
                       appType="codex"
                       appLabel="Codex"
-                      targets={codexTargets}
+                      targets={codexQueue
+                        .filter((item) => item.enabled)
+                        .sort((a, b) => a.queueOrder - b.queueOrder)
+                        .map((item) => ({
+                          id: item.providerId,
+                          name: item.providerName,
+                        }))}
                       status={status}
                     />
                   )}
 
                   {/* Gemini 队列 */}
-                  {geminiTargets.length > 0 && (
+                  {geminiQueue.length > 0 && (
                     <ProviderQueueGroup
                       appType="gemini"
                       appLabel="Gemini"
-                      targets={geminiTargets}
+                      targets={geminiQueue
+                        .filter((item) => item.enabled)
+                        .sort((a, b) => a.queueOrder - b.queueOrder)
+                        .map((item) => ({
+                          id: item.providerId,
+                          name: item.providerName,
+                        }))}
                       status={status}
                     />
                   )}

src/components/settings/AboutSection.tsx

@@ -142,7 +142,7 @@ export function AboutSection({ isPortable }: AboutSectionProps) {
     try {
       const available = await checkUpdate();
       if (!available) {
-        toast.success(t("settings.upToDate"));
+        toast.success(t("settings.upToDate"), { closeButton: true });
       }
     } catch (error) {
       console.error("[AboutSection] Check update failed", error);

src/components/settings/SettingsPage.tsx

@@ -7,7 +7,9 @@ import {
   Coins,
   Database,
   Server,
+  ChevronDown,
 } from "lucide-react";
+import * as AccordionPrimitive from "@radix-ui/react-accordion";
 import { toast } from "sonner";
 import {
   Dialog,
@@ -35,6 +37,7 @@ import { ProxyPanel } from "@/components/proxy";
 import { PricingConfigPanel } from "@/components/usage/PricingConfigPanel";
 import { ModelTestConfigPanel } from "@/components/usage/ModelTestConfigPanel";
 import { AutoFailoverConfigPanel } from "@/components/proxy/AutoFailoverConfigPanel";
+import { FailoverQueueManager } from "@/components/proxy/FailoverQueueManager";
 import { UsageDashboard } from "@/components/usage/UsageDashboard";
 import { useSettings } from "@/hooks/useSettings";
 import { useImportExport } from "@/hooks/useImportExport";
@@ -135,7 +138,7 @@ export function SettingsPage({
   const handleRestartNow = useCallback(async () => {
     setShowRestartPrompt(false);
     if (import.meta.env.DEV) {
-      toast.success(t("settings.devModeRestartHint"));
+      toast.success(t("settings.devModeRestartHint"), { closeButton: true });
       closeAfterSave();
       return;
     }
@@ -278,10 +281,10 @@ export function SettingsPage({
 
                     <AccordionItem
                       value="proxy"
-                      className="rounded-xl glass-card overflow-hidden"
+                      className="rounded-xl glass-card overflow-hidden [&[data-state=open]>.accordion-header]:bg-muted/50"
                     >
-                      <AccordionTrigger className="px-6 py-4 hover:no-underline hover:bg-muted/50 data-[state=open]:bg-muted/50">
-                        <div className="flex flex-1 items-center justify-between pr-4">
+                      <AccordionPrimitive.Header className="accordion-header flex items-center justify-between px-6 py-4 hover:bg-muted/50">
+                        <AccordionPrimitive.Trigger className="flex flex-1 items-center justify-between hover:no-underline [&[data-state=open]>svg]:rotate-180">
                           <div className="flex items-center gap-3">
                             <Server className="h-5 w-5 text-green-500" />
                             <div className="text-left">
@@ -293,27 +296,26 @@ export function SettingsPage({
                               </p>
                             </div>
                           </div>
-                          <div
-                            className="flex items-center gap-4"
-                            onClick={(e) => e.stopPropagation()}
+                          <ChevronDown className="h-4 w-4 shrink-0 transition-transform duration-200" />
+                        </AccordionPrimitive.Trigger>
+
+                        <div className="flex items-center gap-4 pl-4">
+                          <Badge
+                            variant={isRunning ? "default" : "secondary"}
+                            className="gap-1.5 h-6"
                           >
-                            <Badge
-                              variant={isRunning ? "default" : "secondary"}
-                              className="gap-1.5 h-6"
-                            >
-                              <Activity
-                                className={`h-3 w-3 ${isRunning ? "animate-pulse" : ""}`}
-                              />
-                              {isRunning ? "运行中" : "已停止"}
-                            </Badge>
-                            <Switch
-                              checked={isRunning}
-                              onCheckedChange={handleToggleProxy}
-                              disabled={isProxyPending}
+                            <Activity
+                              className={`h-3 w-3 ${isRunning ? "animate-pulse" : ""}`}
                             />
-                          </div>
+                            {isRunning ? "运行中" : "已停止"}
+                          </Badge>
+                          <Switch
+                            checked={isRunning}
+                            onCheckedChange={handleToggleProxy}
+                            disabled={isProxyPending}
+                          />
                         </div>
-                      </AccordionTrigger>
+                      </AccordionPrimitive.Header>
                       <AccordionContent className="px-6 pb-6 pt-0 border-t border-border/50">
                         <ProxyPanel />
                       </AccordionContent>
@@ -343,10 +345,10 @@ export function SettingsPage({
 
                     <AccordionItem
                       value="failover"
-                      className="rounded-xl glass-card overflow-hidden"
+                      className="rounded-xl glass-card overflow-hidden [&[data-state=open]>.accordion-header]:bg-muted/50"
                     >
-                      <AccordionTrigger className="px-6 py-4 hover:no-underline hover:bg-muted/50 data-[state=open]:bg-muted/50">
-                        <div className="flex flex-1 items-center justify-between pr-4">
+                      <AccordionPrimitive.Header className="accordion-header flex items-center justify-between px-6 py-4 hover:bg-muted/50">
+                        <AccordionPrimitive.Trigger className="flex flex-1 items-center justify-between hover:no-underline [&[data-state=open]>svg]:rotate-180">
                           <div className="flex items-center gap-3">
                             <Activity className="h-5 w-5 text-orange-500" />
                             <div className="text-left">
@@ -354,29 +356,70 @@ export function SettingsPage({
                                 自动故障转移
                               </h3>
                               <p className="text-sm text-muted-foreground font-normal">
-                                配置自动故障转移和熔断策略
+                                配置故障转移队列和熔断策略
                               </p>
                             </div>
                           </div>
-                          <div
-                            className="flex items-center gap-4"
-                            onClick={(e) => e.stopPropagation()}
-                          >
-                            <div className="flex items-center gap-2">
-                              {/* Removed status text as requested */}
-                              <Switch
-                                checked={failoverEnabled}
-                                onCheckedChange={setFailoverEnabled}
-                              />
+                          <ChevronDown className="h-4 w-4 shrink-0 transition-transform duration-200" />
+                        </AccordionPrimitive.Trigger>
+
+                        <div className="flex items-center gap-2 pl-4">
+                          <Switch
+                            checked={failoverEnabled}
+                            onCheckedChange={setFailoverEnabled}
+                          />
+                        </div>
+                      </AccordionPrimitive.Header>
+                      <AccordionContent className="px-6 pb-6 pt-4 border-t border-border/50">
+                        <div className="space-y-6">
+                          {/* 故障转移队列管理 */}
+                          <div className="space-y-4">
+                            <div>
+                              <h4 className="text-sm font-semibold">
+                                {t("proxy.failoverQueue.title", "故障转移队列")}
+                              </h4>
+                              <p className="text-xs text-muted-foreground">
+                                {t(
+                                  "proxy.failoverQueue.description",
+                                  "管理各应用的供应商故障转移顺序",
+                                )}
+                              </p>
                             </div>
+                            <Tabs defaultValue="claude" className="w-full">
+                              <TabsList className="grid w-full grid-cols-3">
+                                <TabsTrigger value="claude">Claude</TabsTrigger>
+                                <TabsTrigger value="codex">Codex</TabsTrigger>
+                                <TabsTrigger value="gemini">Gemini</TabsTrigger>
+                              </TabsList>
+                              <TabsContent value="claude" className="mt-4">
+                                <FailoverQueueManager
+                                  appType="claude"
+                                  disabled={!failoverEnabled}
+                                />
+                              </TabsContent>
+                              <TabsContent value="codex" className="mt-4">
+                                <FailoverQueueManager
+                                  appType="codex"
+                                  disabled={!failoverEnabled}
+                                />
+                              </TabsContent>
+                              <TabsContent value="gemini" className="mt-4">
+                                <FailoverQueueManager
+                                  appType="gemini"
+                                  disabled={!failoverEnabled}
+                                />
+                              </TabsContent>
+                            </Tabs>
+                          </div>
+
+                          {/* 熔断器配置 */}
+                          <div className="border-t border-border/50 pt-6">
+                            <AutoFailoverConfigPanel
+                              enabled={failoverEnabled}
+                              onEnabledChange={setFailoverEnabled}
+                            />
                           </div>
                         </div>
-                      </AccordionTrigger>
-                      <AccordionContent className="px-6 pb-6 pt-4 border-t border-border/50">
-                        <AutoFailoverConfigPanel
-                          enabled={failoverEnabled}
-                          onEnabledChange={setFailoverEnabled}
-                        />
                       </AccordionContent>
                     </AccordionItem>
 

src/components/skills/SkillsPage.tsx

@@ -103,7 +103,9 @@ export const SkillsPage = forwardRef<SkillsPageHandle, SkillsPageProps>(
     const handleInstall = async (directory: string) => {
       try {
         await skillsApi.install(directory, selectedApp);
-        toast.success(t("skills.installSuccess", { name: directory }));
+        toast.success(t("skills.installSuccess", { name: directory }), {
+          closeButton: true,
+        });
         await loadSkills();
       } catch (error) {
         const errorMessage =
@@ -132,7 +134,9 @@ export const SkillsPage = forwardRef<SkillsPageHandle, SkillsPageProps>(
     const handleUninstall = async (directory: string) => {
       try {
         await skillsApi.uninstall(directory, selectedApp);
-        toast.success(t("skills.uninstallSuccess", { name: directory }));
+        toast.success(t("skills.uninstallSuccess", { name: directory }), {
+          closeButton: true,
+        });
         await loadSkills();
       } catch (error) {
         const errorMessage =
@@ -180,12 +184,15 @@ export const SkillsPage = forwardRef<SkillsPageHandle, SkillsPageProps>(
           name: repo.name,
           count: repoSkillCount,
         }),
+        { closeButton: true },
       );
     };
 
     const handleRemoveRepo = async (owner: string, name: string) => {
       await skillsApi.removeRepo(owner, name);
-      toast.success(t("skills.repo.removeSuccess", { owner, name }));
+      toast.success(t("skills.repo.removeSuccess", { owner, name }), {
+        closeButton: true,
+      });
       await Promise.all([loadRepos(), loadSkills()]);
     };
 

src/components/usage/ModelTestConfigPanel.tsx

@@ -47,7 +47,9 @@ export function ModelTestConfigPanel() {
     try {
       setIsSaving(true);
       await saveStreamCheckConfig(config);
-      toast.success(t("streamCheck.configSaved", "健康检查配置已保存"));
+      toast.success(t("streamCheck.configSaved", "健康检查配置已保存"), {
+        closeButton: true,
+      });
     } catch (e) {
       toast.error(
         t("streamCheck.configSaveFailed", "保存失败") + ": " + String(e),

src/components/usage/PricingEditModal.tsx

@@ -76,6 +76,7 @@ export function PricingEditModal({
         isNew
           ? t("usage.pricingAdded", "定价已添加")
           : t("usage.pricingUpdated", "定价已更新"),
+        { closeButton: true },
       );
 
       onClose();

src/hooks/useDragSort.ts

@@ -87,6 +87,7 @@ export function useDragSort(providers: Record<string, Provider>, appId: AppId) {
           t("provider.sortUpdated", {
             defaultValue: "排序已更新",
           }),
+          { closeButton: true },
         );
       } catch (error) {
         console.error("Failed to update provider sort order", error);

src/hooks/useImportExport.ts

@@ -113,6 +113,7 @@ export function useImportExport(
           t("settings.importSuccess", {
             defaultValue: "配置导入成功",
           }),
+          { closeButton: true },
         );
 
         successTimerRef.current = window.setTimeout(() => {
@@ -170,6 +171,7 @@ export function useImportExport(
           t("settings.configExported", {
             defaultValue: "配置已导出",
           }) + `\n${displayPath}`,
+          { closeButton: true },
         );
       } else {
         toast.error(

src/hooks/usePromptActions.ts

@@ -36,7 +36,7 @@ export function usePromptActions(appId: AppId) {
       try {
         await promptsApi.upsertPrompt(appId, id, prompt);
         await reload();
-        toast.success(t("prompts.saveSuccess"));
+        toast.success(t("prompts.saveSuccess"), { closeButton: true });
       } catch (error) {
         toast.error(t("prompts.saveFailed"));
         throw error;
@@ -50,7 +50,7 @@ export function usePromptActions(appId: AppId) {
       try {
         await promptsApi.deletePrompt(appId, id);
         await reload();
-        toast.success(t("prompts.deleteSuccess"));
+        toast.success(t("prompts.deleteSuccess"), { closeButton: true });
       } catch (error) {
         toast.error(t("prompts.deleteFailed"));
         throw error;
@@ -64,7 +64,7 @@ export function usePromptActions(appId: AppId) {
       try {
         await promptsApi.enablePrompt(appId, id);
         await reload();
-        toast.success(t("prompts.enableSuccess"));
+        toast.success(t("prompts.enableSuccess"), { closeButton: true });
       } catch (error) {
         toast.error(t("prompts.enableFailed"));
         throw error;
@@ -104,14 +104,14 @@ export function usePromptActions(appId: AppId) {
       try {
         if (enabled) {
           await promptsApi.enablePrompt(appId, id);
-          toast.success(t("prompts.enableSuccess"));
+          toast.success(t("prompts.enableSuccess"), { closeButton: true });
         } else {
           // 禁用提示词 - 需要后端支持
           await promptsApi.upsertPrompt(appId, id, {
             ...prompts[id],
             enabled: false,
           });
-          toast.success(t("prompts.disableSuccess"));
+          toast.success(t("prompts.disableSuccess"), { closeButton: true });
         }
         await reload();
       } catch (error) {
@@ -130,7 +130,7 @@ export function usePromptActions(appId: AppId) {
     try {
       const id = await promptsApi.importFromFile(appId);
       await reload();
-      toast.success(t("prompts.importSuccess"));
+      toast.success(t("prompts.importSuccess"), { closeButton: true });
       return id;
     } catch (error) {
       toast.error(t("prompts.importFailed"));

src/hooks/useProviderActions.ts

@@ -119,6 +119,7 @@ export function useProviderActions(activeApp: AppId) {
           t("provider.usageSaved", {
             defaultValue: "用量查询配置已保存",
           }),
+          { closeButton: true },
         );
       } catch (error) {
         const detail =

src/hooks/useProxyConfig.ts

@@ -24,7 +24,7 @@ export function useProxyConfig() {
     mutationFn: (newConfig: ProxyConfig) =>
       invoke("update_proxy_config", { config: newConfig }),
     onSuccess: () => {
-      toast.success("代理配置已保存");
+      toast.success("代理配置已保存", { closeButton: true });
       queryClient.invalidateQueries({ queryKey: ["proxyConfig"] });
       queryClient.invalidateQueries({ queryKey: ["proxyStatus"] });
     },

src/hooks/useProxyStatus.ts

@@ -40,6 +40,7 @@ export function useProxyStatus() {
         t("proxy.startedWithTakeover", {
           defaultValue: `代理模式已启用 - ${info.address}:${info.port}`,
         }),
+        { closeButton: true },
       );
       queryClient.invalidateQueries({ queryKey: ["proxyStatus"] });
       queryClient.invalidateQueries({ queryKey: ["proxyTakeoverActive"] });
@@ -62,9 +63,12 @@ export function useProxyStatus() {
         t("proxy.stoppedWithRestore", {
           defaultValue: "代理模式已关闭，配置已恢复",
         }),
+        { closeButton: true },
       );
       queryClient.invalidateQueries({ queryKey: ["proxyStatus"] });
       queryClient.invalidateQueries({ queryKey: ["proxyTakeoverActive"] });
+      // 清除所有供应商健康状态缓存（后端已清空数据库记录）
+      queryClient.invalidateQueries({ queryKey: ["providerHealth"] });
     },
     onError: (error: Error) => {
       const detail = extractErrorMessage(error) || "未知错误";

src/hooks/useSettings.ts

@@ -309,6 +309,7 @@ export function useSettings(): UseSettingsResult {
             t("notifications.settingsSaved", {
               defaultValue: "设置已保存",
             }),
+            { closeButton: true },
           );
         }
 

src/hooks/useStreamCheck.ts

@@ -28,6 +28,7 @@ export function useStreamCheck(appId: AppId) {
               time: result.responseTimeMs,
               defaultValue: `${providerName} 运行正常 (${result.responseTimeMs}ms)`,
             }),
+            { closeButton: true },
           );
         } else if (result.status === "degraded") {
           toast.warning(

src/i18n/locales/en.json

@@ -112,7 +112,7 @@
     "providerAdded": "Provider added",
     "providerSaved": "Provider configuration saved",
     "providerDeleted": "Provider deleted successfully",
-    "switchSuccess": "Switch successful! Please restart {{appName}} terminal to take effect",
+    "switchSuccess": "Switch successful!",
     "switchFailedTitle": "Switch failed",
     "switchFailed": "Switch failed: {{error}}",
     "autoImported": "Default provider created from existing configuration",
@@ -365,7 +365,10 @@
     "justNow": "Just now",
     "minutesAgo": "{{count}} min ago",
     "hoursAgo": "{{count}} hr ago",
-    "daysAgo": "{{count}} day ago"
+    "daysAgo": "{{count}} day ago",
+    "multiplePlans": "{{count}} plans",
+    "expand": "Expand",
+    "collapse": "Collapse"
   },
   "usageScript": {
     "title": "Configure Usage Query",
@@ -378,6 +381,10 @@
     "templateGeneral": "General",
     "templateNewAPI": "NewAPI",
     "credentialsConfig": "Credentials",
+    "credentialsHint": "Leave empty to use provider config",
+    "optional": "optional",
+    "apiKeyPlaceholder": "Leave empty to use provider's API Key",
+    "baseUrlPlaceholder": "Leave empty to use provider's base URL",
     "baseUrl": "Base URL",
     "accessToken": "Access Token",
     "accessTokenPlaceholder": "Generate in 'Security Settings'",
@@ -534,9 +541,6 @@
     "env": "Environment (one per line, KEY=VALUE)",
     "envPlaceholder": "FOO=bar\nHELLO=world",
     "reset": "Reset",
-    "notice": {
-      "restartClaude": "Written. Restart Claude to take effect."
-    },
     "msg": {
       "saved": "Saved",
       "deleted": "Deleted",
@@ -840,5 +844,50 @@
   },
   "agents": {
     "title": "Agents"
+  },
+  "proxy": {
+    "failoverQueue": {
+      "title": "Failover Queue",
+      "description": "Manage failover order for each app's providers",
+      "info": "The current active provider always takes priority. When requests fail, the system will try other providers in queue order.",
+      "selectProvider": "Select a provider to add to queue",
+      "noAvailableProviders": "No providers available to add",
+      "empty": "Failover queue is empty. Add providers to enable automatic failover.",
+      "dragHint": "Drag providers to adjust failover order. Lower numbers have higher priority.",
+      "toggleEnabled": "Enable/Disable",
+      "addSuccess": "Added to failover queue",
+      "addFailed": "Failed to add",
+      "removeSuccess": "Removed from failover queue",
+      "removeFailed": "Failed to remove",
+      "reorderSuccess": "Queue order updated",
+      "reorderFailed": "Failed to update order",
+      "toggleFailed": "Failed to update status"
+    },
+    "autoFailover": {
+      "info": "When the failover queue has multiple providers, the system will try them in priority order when requests fail. When a provider reaches the consecutive failure threshold, the circuit breaker will open and skip it temporarily.",
+      "configSaved": "Auto failover config saved",
+      "configSaveFailed": "Failed to save",
+      "retrySettings": "Retry & Timeout Settings",
+      "failureThreshold": "Failure Threshold",
+      "failureThresholdHint": "Open circuit breaker after this many consecutive failures (recommended: 3-10)",
+      "timeout": "Recovery Wait Time (seconds)",
+      "timeoutHint": "Wait this long before trying to recover after circuit opens (recommended: 30-120)",
+      "circuitBreakerSettings": "Circuit Breaker Advanced Settings",
+      "successThreshold": "Recovery Success Threshold",
+      "successThresholdHint": "Close circuit breaker after this many successes in half-open state",
+      "errorRate": "Error Rate Threshold (%)",
+      "errorRateHint": "Open circuit breaker when error rate exceeds this value",
+      "minRequests": "Minimum Requests",
+      "minRequestsHint": "Minimum requests before calculating error rate",
+      "explanationTitle": "How It Works",
+      "failureThresholdLabel": "Failure Threshold",
+      "failureThresholdExplain": "Circuit breaker opens after this many consecutive failures, making the provider temporarily unavailable",
+      "timeoutLabel": "Recovery Wait Time",
+      "timeoutExplain": "After circuit opens, wait this long before trying half-open state",
+      "successThresholdLabel": "Recovery Success Threshold",
+      "successThresholdExplain": "In half-open state, close circuit breaker after this many successes, making provider available again",
+      "errorRateLabel": "Error Rate Threshold",
+      "errorRateExplain": "Open circuit breaker when error rate exceeds this value, even if failure threshold not reached"
+    }
   }
 }

src/i18n/locales/ja.json

@@ -112,7 +112,7 @@
     "providerAdded": "プロバイダーを追加しました",
     "providerSaved": "プロバイダー設定を保存しました",
     "providerDeleted": "プロバイダーを削除しました",
-    "switchSuccess": "切り替え成功！ {{appName}} ターミナルを再起動すると反映されます",
+    "switchSuccess": "切り替え成功！",
     "switchFailedTitle": "切り替えに失敗しました",
     "switchFailed": "切り替えに失敗しました: {{error}}",
     "autoImported": "既存設定からデフォルトプロバイダーを自動作成しました",
@@ -365,7 +365,10 @@
     "justNow": "たった今",
     "minutesAgo": "{{count}} 分前",
     "hoursAgo": "{{count}} 時間前",
-    "daysAgo": "{{count}} 日前"
+    "daysAgo": "{{count}} 日前",
+    "multiplePlans": "{{count}} プラン",
+    "expand": "展開",
+    "collapse": "折りたたむ"
   },
   "usageScript": {
     "title": "利用状況を設定",
@@ -378,6 +381,10 @@
     "templateGeneral": "General",
     "templateNewAPI": "NewAPI",
     "credentialsConfig": "認証情報",
+    "credentialsHint": "空欄の場合はプロバイダー設定を使用",
+    "optional": "オプション",
+    "apiKeyPlaceholder": "空欄の場合はプロバイダーの API Key を使用",
+    "baseUrlPlaceholder": "空欄の場合はプロバイダーの Base URL を使用",
     "baseUrl": "Base URL",
     "accessToken": "Access Token",
     "accessTokenPlaceholder": "「Security Settings」で生成",
@@ -534,9 +541,6 @@
     "env": "環境変数（1 行に 1 件、KEY=VALUE）",
     "envPlaceholder": "FOO=bar\nHELLO=world",
     "reset": "リセット",
-    "notice": {
-      "restartClaude": "書き込みました。Claude を再起動すると反映されます。"
-    },
     "msg": {
       "saved": "保存しました",
       "deleted": "削除しました",

src/i18n/locales/zh.json

@@ -112,7 +112,7 @@
     "providerAdded": "供应商已添加",
     "providerSaved": "供应商配置已保存",
     "providerDeleted": "供应商删除成功",
-    "switchSuccess": "切换成功！请重启 {{appName}} 终端以生效",
+    "switchSuccess": "切换成功！",
     "switchFailedTitle": "切换失败",
     "switchFailed": "切换失败：{{error}}",
     "autoImported": "已从现有配置创建默认供应商",
@@ -365,7 +365,10 @@
     "justNow": "刚刚",
     "minutesAgo": "{{count}} 分钟前",
     "hoursAgo": "{{count}} 小时前",
-    "daysAgo": "{{count}} 天前"
+    "daysAgo": "{{count}} 天前",
+    "multiplePlans": "{{count}} 个套餐",
+    "expand": "展开",
+    "collapse": "收起"
   },
   "usageScript": {
     "title": "配置用量查询",
@@ -378,6 +381,10 @@
     "templateGeneral": "通用模板",
     "templateNewAPI": "NewAPI",
     "credentialsConfig": "凭证配置",
+    "credentialsHint": "留空则自动使用供应商配置",
+    "optional": "可选",
+    "apiKeyPlaceholder": "留空则使用供应商的 API Key",
+    "baseUrlPlaceholder": "留空则使用供应商的请求地址",
     "baseUrl": "请求地址",
     "accessToken": "访问令牌（在个人安全设置里获取）",
     "accessTokenPlaceholder": "在'安全设置'里生成",
@@ -534,9 +541,6 @@
     "env": "环境变量 (一行一个，KEY=VALUE)",
     "envPlaceholder": "FOO=bar\nHELLO=world",
     "reset": "重置",
-    "notice": {
-      "restartClaude": "已写入配置，重启 Claude 生效"
-    },
     "msg": {
       "saved": "已保存",
       "deleted": "已删除",
@@ -840,5 +844,50 @@
   },
   "agents": {
     "title": "智能体"
+  },
+  "proxy": {
+    "failoverQueue": {
+      "title": "故障转移队列",
+      "description": "管理各应用的供应商故障转移顺序",
+      "info": "当前激活的供应商始终优先。当请求失败时，系统会按队列顺序依次尝试其他供应商。",
+      "selectProvider": "选择供应商添加到队列",
+      "noAvailableProviders": "没有可添加的供应商",
+      "empty": "故障转移队列为空。添加供应商以启用自动故障转移。",
+      "dragHint": "拖拽供应商可调整故障转移顺序，序号越小优先级越高。",
+      "toggleEnabled": "启用/禁用",
+      "addSuccess": "已添加到故障转移队列",
+      "addFailed": "添加失败",
+      "removeSuccess": "已从故障转移队列移除",
+      "removeFailed": "移除失败",
+      "reorderSuccess": "队列顺序已更新",
+      "reorderFailed": "更新顺序失败",
+      "toggleFailed": "状态更新失败"
+    },
+    "autoFailover": {
+      "info": "当故障转移队列中配置了多个供应商时，系统会在请求失败时按优先级顺序依次尝试。当某个供应商连续失败达到阈值时，熔断器会打开并在一段时间内跳过该供应商。",
+      "configSaved": "自动故障转移配置已保存",
+      "configSaveFailed": "保存失败",
+      "retrySettings": "重试与超时设置",
+      "failureThreshold": "失败阈值",
+      "failureThresholdHint": "连续失败多少次后打开熔断器（建议: 3-10）",
+      "timeout": "恢复等待时间（秒）",
+      "timeoutHint": "熔断器打开后，等待多久后尝试恢复（建议: 30-120）",
+      "circuitBreakerSettings": "熔断器高级设置",
+      "successThreshold": "恢复成功阈值",
+      "successThresholdHint": "半开状态下成功多少次后关闭熔断器",
+      "errorRate": "错误率阈值 (%)",
+      "errorRateHint": "错误率超过此值时打开熔断器",
+      "minRequests": "最小请求数",
+      "minRequestsHint": "计算错误率前的最小请求数",
+      "explanationTitle": "工作原理",
+      "failureThresholdLabel": "失败阈值",
+      "failureThresholdExplain": "连续失败达到此次数时，熔断器打开，该供应商暂时不可用",
+      "timeoutLabel": "恢复等待时间",
+      "timeoutExplain": "熔断器打开后，等待此时间后尝试半开状态",
+      "successThresholdLabel": "恢复成功阈值",
+      "successThresholdExplain": "半开状态下，成功达到此次数时关闭熔断器，供应商恢复可用",
+      "errorRateLabel": "错误率阈值",
+      "errorRateExplain": "错误率超过此值时，即使未达到失败阈值也会打开熔断器"
+    }
   }
 }

src/lib/api/deeplink.ts

@@ -38,6 +38,15 @@ export interface DeepLinkImportRequest {
   config?: string;
   configFormat?: string;
   configUrl?: string;
+
+  // Usage script fields (v3.9+)
+  usageEnabled?: boolean;
+  usageScript?: string;
+  usageApiKey?: string;
+  usageBaseUrl?: string;
+  usageAccessToken?: string;
+  usageUserId?: string;
+  usageAutoInterval?: number;
 }
 
 export interface McpImportResult {

src/lib/api/failover.ts

@@ -3,6 +3,7 @@ import type {
   ProviderHealth,
   CircuitBreakerConfig,
   CircuitBreakerStats,
+  FailoverQueueItem,
 } from "@/types/proxy";
 
 export interface Provider {
@@ -17,23 +18,10 @@ export interface Provider {
   meta?: unknown;
   icon?: string;
   iconColor?: string;
-  isProxyTarget?: boolean;
 }
 
 export const failoverApi = {
-  // 获取代理目标列表
-  async getProxyTargets(appType: string): Promise<Provider[]> {
-    return invoke("get_proxy_targets", { appType });
-  },
-
-  // 设置代理目标
-  async setProxyTarget(
-    providerId: string,
-    appType: string,
-    enabled: boolean,
-  ): Promise<void> {
-    return invoke("set_proxy_target", { providerId, appType, enabled });
-  },
+  // ========== 熔断器 API ==========
 
   // 获取供应商健康状态
   async getProviderHealth(
@@ -70,4 +58,50 @@ export const failoverApi = {
   ): Promise<CircuitBreakerStats | null> {
     return invoke("get_circuit_breaker_stats", { providerId, appType });
   },
+
+  // ========== 故障转移队列 API（新） ==========
+
+  // 获取故障转移队列
+  async getFailoverQueue(appType: string): Promise<FailoverQueueItem[]> {
+    return invoke("get_failover_queue", { appType });
+  },
+
+  // 获取可添加到队列的供应商（不在队列中的）
+  async getAvailableProvidersForFailover(appType: string): Promise<Provider[]> {
+    return invoke("get_available_providers_for_failover", { appType });
+  },
+
+  // 添加供应商到故障转移队列
+  async addToFailoverQueue(appType: string, providerId: string): Promise<void> {
+    return invoke("add_to_failover_queue", { appType, providerId });
+  },
+
+  // 从故障转移队列移除供应商
+  async removeFromFailoverQueue(
+    appType: string,
+    providerId: string,
+  ): Promise<void> {
+    return invoke("remove_from_failover_queue", { appType, providerId });
+  },
+
+  // 重新排序故障转移队列
+  async reorderFailoverQueue(
+    appType: string,
+    providerIds: string[],
+  ): Promise<void> {
+    return invoke("reorder_failover_queue", { appType, providerIds });
+  },
+
+  // 设置故障转移队列项的启用状态
+  async setFailoverItemEnabled(
+    appType: string,
+    providerId: string,
+    enabled: boolean,
+  ): Promise<void> {
+    return invoke("set_failover_item_enabled", {
+      appType,
+      providerId,
+      enabled,
+    });
+  },
 };

src/lib/api/providers.ts

@@ -38,10 +38,6 @@ export const providersApi = {
     return await invoke("switch_provider", { id, app: appId });
   },
 
-  async setProxyTarget(id: string, appId: AppId): Promise<boolean> {
-    return await invoke("set_proxy_target_provider", { id, app: appId });
-  },
-
   async importDefault(appId: AppId): Promise<boolean> {
     return await invoke("import_default_config", { app: appId });
   },

src/lib/query/failover.ts

@@ -1,16 +1,7 @@
 import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import { failoverApi } from "@/lib/api/failover";
 
-/**
- * 获取代理目标列表
- */
-export function useProxyTargets(appType: string) {
-  return useQuery({
-    queryKey: ["proxyTargets", appType],
-    queryFn: () => failoverApi.getProxyTargets(appType),
-    enabled: !!appType,
-  });
-}
+// ========== 熔断器 Hooks ==========
 
 /**
  * 获取供应商健康状态
@@ -25,37 +16,6 @@ export function useProviderHealth(providerId: string, appType: string) {
   });
 }
 
-/**
- * 设置代理目标
- */
-export function useSetProxyTarget() {
-  const queryClient = useQueryClient();
-
-  return useMutation({
-    mutationFn: ({
-      providerId,
-      appType,
-      enabled,
-    }: {
-      providerId: string;
-      appType: string;
-      enabled: boolean;
-    }) => failoverApi.setProxyTarget(providerId, appType, enabled),
-    onSuccess: (_, variables) => {
-      // 刷新代理目标列表
-      queryClient.invalidateQueries({
-        queryKey: ["proxyTargets", variables.appType],
-      });
-      // 刷新供应商列表
-      queryClient.invalidateQueries({ queryKey: ["providers"] });
-      // 刷新健康状态
-      queryClient.invalidateQueries({
-        queryKey: ["providerHealth", variables.providerId, variables.appType],
-      });
-    },
-  });
-}
-
 /**
  * 重置熔断器
  */
@@ -114,3 +74,123 @@ export function useCircuitBreakerStats(providerId: string, appType: string) {
     refetchInterval: 5000, // 每 5 秒刷新一次
   });
 }
+
+// ========== 故障转移队列 Hooks（新） ==========
+
+/**
+ * 获取故障转移队列
+ */
+export function useFailoverQueue(appType: string) {
+  return useQuery({
+    queryKey: ["failoverQueue", appType],
+    queryFn: () => failoverApi.getFailoverQueue(appType),
+    enabled: !!appType,
+  });
+}
+
+/**
+ * 获取可添加到队列的供应商
+ */
+export function useAvailableProvidersForFailover(appType: string) {
+  return useQuery({
+    queryKey: ["availableProvidersForFailover", appType],
+    queryFn: () => failoverApi.getAvailableProvidersForFailover(appType),
+    enabled: !!appType,
+  });
+}
+
+/**
+ * 添加供应商到故障转移队列
+ */
+export function useAddToFailoverQueue() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: ({
+      appType,
+      providerId,
+    }: {
+      appType: string;
+      providerId: string;
+    }) => failoverApi.addToFailoverQueue(appType, providerId),
+    onSuccess: (_, variables) => {
+      queryClient.invalidateQueries({
+        queryKey: ["failoverQueue", variables.appType],
+      });
+      queryClient.invalidateQueries({
+        queryKey: ["availableProvidersForFailover", variables.appType],
+      });
+    },
+  });
+}
+
+/**
+ * 从故障转移队列移除供应商
+ */
+export function useRemoveFromFailoverQueue() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: ({
+      appType,
+      providerId,
+    }: {
+      appType: string;
+      providerId: string;
+    }) => failoverApi.removeFromFailoverQueue(appType, providerId),
+    onSuccess: (_, variables) => {
+      queryClient.invalidateQueries({
+        queryKey: ["failoverQueue", variables.appType],
+      });
+      queryClient.invalidateQueries({
+        queryKey: ["availableProvidersForFailover", variables.appType],
+      });
+    },
+  });
+}
+
+/**
+ * 重新排序故障转移队列
+ */
+export function useReorderFailoverQueue() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: ({
+      appType,
+      providerIds,
+    }: {
+      appType: string;
+      providerIds: string[];
+    }) => failoverApi.reorderFailoverQueue(appType, providerIds),
+    onSuccess: (_, variables) => {
+      queryClient.invalidateQueries({
+        queryKey: ["failoverQueue", variables.appType],
+      });
+    },
+  });
+}
+
+/**
+ * 设置故障转移队列项的启用状态
+ */
+export function useSetFailoverItemEnabled() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: ({
+      appType,
+      providerId,
+      enabled,
+    }: {
+      appType: string;
+      providerId: string;
+      enabled: boolean;
+    }) => failoverApi.setFailoverItemEnabled(appType, providerId, enabled),
+    onSuccess: (_, variables) => {
+      queryClient.invalidateQueries({
+        queryKey: ["failoverQueue", variables.appType],
+      });
+    },
+  });
+}

src/lib/query/mutations.ts

@@ -180,34 +180,6 @@ export const useSwitchProviderMutation = (appId: AppId) => {
   });
 };
 
-export const useSetProxyTargetMutation = (appId: AppId) => {
-  const queryClient = useQueryClient();
-  const { t } = useTranslation();
-
-  return useMutation({
-    mutationFn: async (providerId: string) => {
-      return await providersApi.setProxyTarget(providerId, appId);
-    },
-    onSuccess: async () => {
-      await queryClient.invalidateQueries({ queryKey: ["providers", appId] });
-      toast.success(
-        t("notifications.proxyTargetSet", {
-          defaultValue: "已设置代理目标",
-        }),
-      );
-    },
-    onError: (error: Error) => {
-      const detail = extractErrorMessage(error) || t("common.unknown");
-      toast.error(
-        t("notifications.setProxyTargetFailed", {
-          defaultValue: "设置代理目标失败: {{error}}",
-          error: detail,
-        }),
-      );
-    },
-  });
-};
-
 export const useSaveSettingsMutation = () => {
   const queryClient = useQueryClient();
 

src/types.ts

@@ -23,8 +23,6 @@ export interface Provider {
   // 图标配置
   icon?: string; // 图标名称（如 "openai", "anthropic"）
   iconColor?: string; // 图标颜色（Hex 格式，如 "#00A67E"）
-  // 新增：是否为代理目标
-  isProxyTarget?: boolean;
 }
 
 export interface AppConfig {

src/types/proxy.ts

@@ -93,3 +93,12 @@ export interface ProxyUsageRecord {
   error: string | null;
   timestamp: string;
 }
+
+// 故障转移队列条目
+export interface FailoverQueueItem {
+  providerId: string;
+  providerName: string;
+  queueOrder: number;
+  enabled: boolean;
+  createdAt: number;
+}

src/utils/formatters.ts

@@ -1,6 +1,6 @@
 /**
  * 格式化 JSON 字符串
- * @param value - 原始 JSON 字符串（支持带键名包装的格式）
+ * @param value - 原始 JSON 字符串
  * @returns 格式化后的 JSON 字符串（2 空格缩进）
  * @throws 如果 JSON 格式无效
  */
@@ -9,9 +9,8 @@ export function formatJSON(value: string): string {
   if (!trimmed) {
     return "";
   }
-  // 使用智能解析器来处理可能的片段格式
-  const result = parseSmartMcpJson(trimmed);
-  return result.formattedConfig;
+  const parsed = JSON.parse(trimmed);
+  return JSON.stringify(parsed, null, 2);
 }
 
 /**

tests/components/SettingsDialog.test.tsx

@@ -19,6 +19,23 @@ vi.mock("react-i18next", () => ({
   useTranslation: () => ({ t: tMock }),
 }));
 
+vi.mock("@/hooks/useProxyStatus", () => ({
+  useProxyStatus: () => ({
+    status: null,
+    isLoading: false,
+    isRunning: false,
+    isTakeoverActive: false,
+    startWithTakeover: vi.fn(),
+    stopWithRestore: vi.fn(),
+    switchProxyProvider: vi.fn(),
+    checkRunning: vi.fn(),
+    checkTakeoverActive: vi.fn(),
+    isStarting: false,
+    isStopping: false,
+    isPending: false,
+  }),
+}));
+
 interface SettingsMock {
   settings: any;
   isLoading: boolean;
@@ -288,6 +305,7 @@ describe("SettingsPage Component", () => {
     });
 
     fireEvent.click(screen.getByText("settings.tabAdvanced"));
+    fireEvent.click(screen.getByText("数据管理"));
 
     // 有文件时，点击导入按钮执行 importConfig
     fireEvent.click(
@@ -363,6 +381,7 @@ describe("SettingsPage Component", () => {
     await waitFor(() => {
       expect(toastSuccessMock).toHaveBeenCalledWith(
         "settings.devModeRestartHint",
+        expect.objectContaining({ closeButton: true }),
       );
     });
   });
@@ -393,6 +412,7 @@ describe("SettingsPage Component", () => {
     render(<SettingsPage open={true} onOpenChange={vi.fn()} />);
 
     fireEvent.click(screen.getByText("settings.tabAdvanced"));
+    fireEvent.click(screen.getByText("配置文件目录"));
 
     fireEvent.click(screen.getByText("browse-directory"));
     expect(settingsMock.browseDirectory).toHaveBeenCalledWith("claude");

tests/hooks/useImportExport.extra.test.tsx

@@ -120,6 +120,7 @@ describe("useImportExport Hook (edge cases)", () => {
     expect(exportConfigMock).toHaveBeenCalledWith("/exports/config.json");
     expect(toastSuccessMock).toHaveBeenCalledWith(
       expect.stringContaining("/final/config.json"),
+      expect.objectContaining({ closeButton: true }),
     );
   });
 });

tests/hooks/useImportExport.test.tsx

@@ -180,6 +180,7 @@ describe("useImportExport Hook", () => {
     expect(exportConfigMock).toHaveBeenCalledWith("/export.json");
     expect(toastSuccessMock).toHaveBeenCalledWith(
       expect.stringContaining("/backup/export.json"),
+      expect.objectContaining({ closeButton: true }),
     );
   });
 

tests/integration/SettingsDialog.test.tsx

@@ -150,6 +150,7 @@ describe("SettingsPage integration", () => {
       expect(screen.getByText("language:zh")).toBeInTheDocument(),
     );
     fireEvent.click(screen.getByText("settings.tabAdvanced"));
+    fireEvent.click(screen.getByText("配置文件目录"));
     const appInput = await screen.findByPlaceholderText(
       "settings.browsePlaceholderApp",
     );
@@ -165,6 +166,7 @@ describe("SettingsPage integration", () => {
     );
 
     fireEvent.click(screen.getByText("settings.tabAdvanced"));
+    fireEvent.click(screen.getByText("数据管理"));
     fireEvent.click(screen.getByText("settings.selectConfigFile"));
     await waitFor(() =>
       expect(screen.getByTestId("selected-file").textContent).toContain(
@@ -188,6 +190,7 @@ describe("SettingsPage integration", () => {
     );
 
     fireEvent.click(screen.getByText("settings.tabAdvanced"));
+    fireEvent.click(screen.getByText("配置文件目录"));
     const appInput = await screen.findByPlaceholderText(
       "settings.browsePlaceholderApp",
     );
@@ -214,6 +217,7 @@ describe("SettingsPage integration", () => {
     );
 
     fireEvent.click(screen.getByText("settings.tabAdvanced"));
+    fireEvent.click(screen.getByText("配置文件目录"));
 
     const browseButtons = screen.getAllByTitle("settings.browseDirectory");
     const resetButtons = screen.getAllByTitle("settings.resetDefault");
@@ -253,6 +257,7 @@ describe("SettingsPage integration", () => {
       expect(screen.getByText("language:zh")).toBeInTheDocument(),
     );
     fireEvent.click(screen.getByText("settings.tabAdvanced"));
+    fireEvent.click(screen.getByText("数据管理"));
 
     server.use(
       http.post("http://tauri.local/save_file_dialog", () =>

tests/msw/handlers.ts

@@ -236,4 +236,64 @@ export const handlers = [
   http.post(`${TAURI_ENDPOINT}/sync_current_providers_live`, () =>
     success({ success: true }),
   ),
+
+  // Proxy status (for SettingsPage / ProxyPanel hooks)
+  http.post(`${TAURI_ENDPOINT}/get_proxy_status`, () =>
+    success({
+      running: false,
+      address: "127.0.0.1",
+      port: 0,
+      active_connections: 0,
+      total_requests: 0,
+      success_requests: 0,
+      failed_requests: 0,
+      success_rate: 0,
+      uptime_seconds: 0,
+      current_provider: null,
+      current_provider_id: null,
+      last_request_at: null,
+      last_error: null,
+      failover_count: 0,
+      active_targets: [],
+    }),
+  ),
+
+  http.post(`${TAURI_ENDPOINT}/is_live_takeover_active`, () => success(false)),
+
+  // Failover / circuit breaker defaults
+  http.post(`${TAURI_ENDPOINT}/get_failover_queue`, () => success([])),
+  http.post(`${TAURI_ENDPOINT}/get_available_providers_for_failover`, () =>
+    success([]),
+  ),
+  http.post(`${TAURI_ENDPOINT}/add_to_failover_queue`, () => success(true)),
+  http.post(`${TAURI_ENDPOINT}/remove_from_failover_queue`, () => success(true)),
+  http.post(`${TAURI_ENDPOINT}/reorder_failover_queue`, () => success(true)),
+  http.post(`${TAURI_ENDPOINT}/set_failover_item_enabled`, () => success(true)),
+
+  http.post(`${TAURI_ENDPOINT}/get_circuit_breaker_config`, () =>
+    success({
+      failureThreshold: 3,
+      successThreshold: 2,
+      timeoutSeconds: 60,
+      errorRateThreshold: 50,
+      minRequests: 5,
+    }),
+  ),
+  http.post(`${TAURI_ENDPOINT}/update_circuit_breaker_config`, () =>
+    success(true),
+  ),
+  http.post(`${TAURI_ENDPOINT}/get_provider_health`, () =>
+    success({
+      provider_id: "mock-provider",
+      app_type: "claude",
+      is_healthy: true,
+      consecutive_failures: 0,
+      last_success_at: null,
+      last_failure_at: null,
+      last_error: null,
+      updated_at: new Date().toISOString(),
+    }),
+  ),
+  http.post(`${TAURI_ENDPOINT}/reset_circuit_breaker`, () => success(true)),
+  http.post(`${TAURI_ENDPOINT}/get_circuit_breaker_stats`, () => success(null)),
 ];