Feat/usage improvements (#508)

* i18n: update cache terminology across all languages

- Change 'Cache Read' to 'Cache Hit' in all languages
- Change 'Cache Write' to 'Cache Creation' in all languages
- Update zh: 缓存读取 → 缓存命中, 缓存写入 → 缓存创建
- Update en: Cache Read → Cache Hit, Cache Write → Cache Creation
- Update ja: キャッシュ読取 → キャッシュヒット, キャッシュ書込 → キャッシュ作成

Affected keys: cacheReadTokens, cacheCreationTokens, cacheReadCost,
cacheWriteCost, cacheRead, cacheWrite

* feat(usage): add cache metrics to trend chart

- Add cache creation tokens visualization (orange line)
- Add cache hit tokens visualization (purple line)
- Add gradient definitions for new cache metrics
- Include cache data in hourly aggregation
- Display cache metrics alongside input/output tokens

This provides better visibility into cache usage patterns over time.

* fix(usage): fix timezone handling in datetime picker

- Add timestampToLocalDatetime() to convert Unix timestamp to local datetime
- Add localDatetimeToTimestamp() with validation for incomplete input
- Fix issue where typing hours/minutes would jump to previous day
- Validate datetime format completeness before conversion
- Use local timezone instead of UTC for datetime-local input

This resolves the issue where users couldn't fine-tune time selection
and the input would jump unexpectedly when editing hours or minutes.

* feat(usage): add auto-refresh for usage statistics

- Add 30-second auto-refresh interval for all usage queries
- Disable background refresh to save resources
- Apply to: summary, trends, provider stats, model stats, request logs
- Queries automatically update when tab is active
- Pause refresh when user switches to another tab

This keeps usage data fresh without manual refresh.

* fix(proxy): improve usage logging and cache token parsing

- Log requests even when usage parsing fails (with default values)
- Add detailed debug logging for usage metrics
- Support cache_read_input_tokens field in Codex responses
- Fallback to input_tokens_details.cached_tokens if needed
- Add test case for cached_tokens in input_tokens_details
- Ensure all requests are tracked in database for analytics

This fixes missing request logs when API responses lack usage data
and improves cache token detection across different response formats.

* style(rust): use inline format args in format! macros

- Replace format!("...", var) with format!("...{var}")
- Update universal provider ID formatting
- Update error message formatting
- Update config.toml generation in Codex provider

Fixes clippy::uninlined_format_args warnings.

* feat(proxy): enhance provider router logging

- Add debug logs for failover queue provider count
- Log circuit breaker state for each provider check
- Add logs for missing current provider scenarios
- Log when no current provider is configured
- Use inline format args for better readability

This improves debugging of provider selection and failover behavior.

* feat(database): update model pricing data

- Update Claude models to full version format (e.g. claude-opus-4-5-20251101)
- Add GPT-5.2 series model pricing (10 models)
- Add GPT-5.1 series model pricing (10 models)
- Add GPT-5 series model pricing (12 models)
- Add Gemini 3 series model pricing (2 models)
- Update Gemini 2.5 series model ID format (use dot separator)
- Unify display names by removing thinking level suffixes

* fix(usage): correct Gemini output token calculation

Fix Gemini API output token parsing to use totalTokenCount - promptTokenCount
instead of candidatesTokenCount alone. This ensures thoughtsTokenCount is
included in output statistics.

- Update from_gemini_response to calculate output from total - input
- Update from_gemini_stream_chunks with same logic for consistency
- Fix from_codex_stream_events to use adjusted token calculation
- Add test case for responses with thoughtsTokenCount
- Update existing tests to match new calculation logic

* fix(usage): correct cache token billing and add Codex format auto-detection

- Avoid double-billing cache tokens by subtracting from input before calculation
- Add smart Codex parser that auto-detects OpenAI vs Codex API format
- Extract model name from Codex responses for accurate tracking

* fix(proxy): improve takeover detection with live config check

- Add live config takeover detection for hot-switch decision
- Rebuild takeover when backup is missing or placeholder remains
- Make detect_takeover_in_live_config_for_app public
- Fix is_takeover_active to use actual takeover status

* refactor(usage): simplify model pricing lookup by removing suffix fallback

Replace complex suffix-stripping fallback with direct prefix/suffix cleanup.
Model IDs are now cleaned by removing vendor prefix (before /) and colon
suffix (after :), then matched exactly against pricing table.

* feat(database): add Chinese AI model pricing data

Add pricing for domestic AI models (CNY/1M tokens):
- Doubao-Seed-Code (ByteDance)
- DeepSeek V3/V3.1/V3.2
- Kimi K2/K2-Thinking/K2-Turbo (Moonshot)
- MiniMax M2/M2.1/M2.1-Lightning
- GLM-4.6/4.7 (Zhipu)
- Mimo V2 Flash (Xiaomi)

Also fix test case to use correct model ID and remove invalid currency column.

* refactor(proxy): improve header forwarding with blacklist approach

Change from whitelist to blacklist mode for request header forwarding.
Only skip headers that will be overridden (auth, host, content-length).
This preserves client's original headers and improves compatibility.

* fix(proxy): bypass timeout and retry configs when failover is disabled

When auto_failover_enabled is false, timeout and retry configurations
should not affect normal request flow. This change ensures:

- create_forwarder: passes 0 for all timeout/retry params when failover
  is disabled, effectively bypassing these checks
- streaming_timeout_config: returns 0 for both first_byte_timeout and
  idle_timeout when failover is disabled

This prevents unnecessary timeout errors and retry attempts when users
have explicitly disabled the failover feature.

* fix(proxy): handle zero value input in failover config fields

* refactor(proxy): remove retry logic and add enabled check for failover

* refactor(proxy): distinguish circuit-open from no-provider errors

* Align usage stats to sliding windows

* feat(proxy): add body and header filtering for upstream requests

* feat(proxy): enable transparent passthrough for headers

- Passthrough anthropic-beta header as-is from client
- Passthrough anthropic-version header from client
- Passthrough client IP headers (x-forwarded-for, x-real-ip) by default
- Filter private params (underscore-prefixed fields) from request body
- No database changes required

* feat(proxy): extract session ID from client requests for logging

- Add SessionIdExtractor to parse session ID from Claude/Codex requests
- Support extraction from metadata.user_id, headers, previous_response_id
- Pass session_id through RequestContext to usage logger
- Enable request correlation by session in proxy_request_logs

src-tauri/src/proxy/handler_context.rs

@@ -5,8 +5,10 @@
 use crate::app_config::AppType;
 use crate::provider::Provider;
 use crate::proxy::{
-    forwarder::RequestForwarder, server::ProxyState, types::AppProxyConfig, ProxyError,
+    extract_session_id, forwarder::RequestForwarder, server::ProxyState, types::AppProxyConfig,
+    ProxyError,
 };
+use axum::http::HeaderMap;
 use std::time::Instant;
 
 /// 流式超时配置
@@ -26,6 +28,7 @@ pub struct StreamingTimeoutConfig {
 /// - 选中的 Provider 列表（用于故障转移）
 /// - 请求模型名称
 /// - 日志标签
+/// - Session ID（用于日志关联）
 pub struct RequestContext {
     /// 请求开始时间
     pub start_time: Instant,
@@ -35,7 +38,7 @@ pub struct RequestContext {
     pub provider: Provider,
     /// 完整的 Provider 列表（用于故障转移）
     providers: Vec<Provider>,
-    /// 请求开始时的“当前供应商”（用于判断是否需要同步 UI/托盘）
+    /// 请求开始时的"当前供应商"（用于判断是否需要同步 UI/托盘）
     ///
     /// 这里使用本地 settings 的设备级 current provider。
     /// 代理模式下如果实际使用的 provider 与此不一致，会触发切换以确保 UI 始终准确。
@@ -49,6 +52,8 @@ pub struct RequestContext {
     /// 应用类型（预留，目前通过 app_type_str 使用）
     #[allow(dead_code)]
     pub app_type: AppType,
+    /// Session ID（从客户端请求提取或新生成）
+    pub session_id: String,
 }
 
 impl RequestContext {
@@ -57,6 +62,7 @@ impl RequestContext {
     /// # Arguments
     /// * `state` - 代理服务器状态
     /// * `body` - 请求体 JSON
+    /// * `headers` - 请求头（用于提取 Session ID）
     /// * `app_type` - 应用类型
     /// * `tag` - 日志标签
     /// * `app_type_str` - 应用类型字符串
@@ -66,6 +72,7 @@ impl RequestContext {
     pub async fn new(
         state: &ProxyState,
         body: &serde_json::Value,
+        headers: &HeaderMap,
         app_type: AppType,
         tag: &'static str,
         app_type_str: &'static str,
@@ -89,13 +96,31 @@ impl RequestContext {
             .unwrap_or("unknown")
             .to_string();
 
+        // 提取 Session ID
+        let session_result = extract_session_id(headers, body, app_type_str);
+        let session_id = session_result.session_id.clone();
+
+        log::debug!(
+            "[{}] Session ID: {} (from {:?}, client_provided: {})",
+            tag,
+            session_id,
+            session_result.source,
+            session_result.client_provided
+        );
+
         // 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()))?;
+            .map_err(|e| match e {
+                crate::error::AppError::AllProvidersCircuitOpen => {
+                    ProxyError::AllProvidersCircuitOpen
+                }
+                crate::error::AppError::NoProvidersConfigured => ProxyError::NoProvidersConfigured,
+                _ => ProxyError::DatabaseError(e.to_string()),
+            })?;
 
         let provider = providers
             .first()
@@ -103,11 +128,12 @@ impl RequestContext {
             .ok_or(ProxyError::NoAvailableProvider)?;
 
         log::info!(
-            "[{}] Provider: {}, model: {}, failover chain: {} providers",
+            "[{}] Provider: {}, model: {}, failover chain: {} providers, session: {}",
             tag,
             provider.name,
             request_model,
-            providers.len()
+            providers.len(),
+            session_id
         );
 
         Ok(Self {
@@ -120,6 +146,7 @@ impl RequestContext {
             tag,
             app_type_str,
             app_type,
+            session_id,
         })
     }
 
@@ -148,18 +175,38 @@ impl RequestContext {
     /// 创建 RequestForwarder
     ///
     /// 使用共享的 ProviderRouter，确保熔断器状态跨请求保持
+    ///
+    /// 配置生效规则：
+    /// - 故障转移开启：超时配置正常生效（0 表示禁用超时）
+    /// - 故障转移关闭：超时配置不生效（全部传入 0）
     pub fn create_forwarder(&self, state: &ProxyState) -> RequestForwarder {
+        let (non_streaming_timeout, first_byte_timeout, idle_timeout) =
+            if self.app_config.auto_failover_enabled {
+                // 故障转移开启：使用配置的值（0 = 禁用超时）
+                (
+                    self.app_config.non_streaming_timeout as u64,
+                    self.app_config.streaming_first_byte_timeout as u64,
+                    self.app_config.streaming_idle_timeout as u64,
+                )
+            } else {
+                // 故障转移关闭：不启用超时配置
+                log::info!(
+                    "[{}] Failover disabled, timeout configs are bypassed",
+                    self.tag
+                );
+                (0, 0, 0)
+            };
+
         RequestForwarder::new(
             state.provider_router.clone(),
-            self.app_config.non_streaming_timeout as u64,
-            self.app_config.max_retries as u8,
+            non_streaming_timeout,
             state.status.clone(),
             state.current_providers.clone(),
             state.failover_manager.clone(),
             state.app_handle.clone(),
             self.current_provider_id.clone(),
-            self.app_config.streaming_first_byte_timeout as u64,
-            self.app_config.streaming_idle_timeout as u64,
+            first_byte_timeout,
+            idle_timeout,
         )
     }
 
@@ -177,11 +224,24 @@ impl RequestContext {
     }
 
     /// 获取流式超时配置
+    ///
+    /// 配置生效规则：
+    /// - 故障转移开启：返回配置的值（0 表示禁用超时检查）
+    /// - 故障转移关闭：返回 0（禁用超时检查）
     #[inline]
     pub fn streaming_timeout_config(&self) -> StreamingTimeoutConfig {
-        StreamingTimeoutConfig {
-            first_byte_timeout: self.app_config.streaming_first_byte_timeout as u64,
-            idle_timeout: self.app_config.streaming_idle_timeout as u64,
+        if self.app_config.auto_failover_enabled {
+            // 故障转移开启：使用配置的值（0 = 禁用超时）
+            StreamingTimeoutConfig {
+                first_byte_timeout: self.app_config.streaming_first_byte_timeout as u64,
+                idle_timeout: self.app_config.streaming_idle_timeout as u64,
+            }
+        } else {
+            // 故障转移关闭：禁用流式超时检查
+            StreamingTimeoutConfig {
+                first_byte_timeout: 0,
+                idle_timeout: 0,
+            }
         }
     }
 }