feat: add project profiles for snapshot-based config switching

Add a profile feature that captures the current provider, MCP,
skills and prompt state for Claude Code and Codex as a named
snapshot, and re-applies it in one click from the header switcher
or the tray Projects submenu.

- New profiles table (schema v12) with current marker in settings
- ProfileService orchestrates the four existing switch primitives
  (provider first, then MCP diff, skills diff, prompt enable)
- Best-effort apply: dangling references become warnings, no rollback
- Header combobox switcher + snapshot-style manage dialog
- Tray Projects submenu shared with the UI apply/event pipeline
- i18n for zh/en/ja/zh-TW under the new profiles domain
- Integration tests covering roundtrip, dangling refs and clear

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

@@ -4,6 +4,7 @@
 
 pub mod failover;
 pub mod mcp;
+pub mod profiles;
 pub mod prompts;
 pub mod providers;
 pub mod providers_seed;
@@ -15,5 +16,6 @@ pub mod universal_providers;
 pub mod usage_rollup;
 
 // 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
+// 导出 FailoverQueueItem / Profile 供外部使用
 pub use failover::FailoverQueueItem;
+pub use profiles::Profile;

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

@@ -0,0 +1,196 @@
+//! 项目 Profile 数据访问对象
+//!
+//! profiles 表存放按 app 快照的配置方案（供应商/MCP/Skills/Prompt），
+//! payload 为原始 JSON 文本，解析在 service 层进行。
+//! current_profile_id 存放于 settings 表（key-value）。
+
+use crate::database::{lock_conn, Database};
+use crate::error::AppError;
+use rusqlite::params;
+
+const CURRENT_PROFILE_ID_KEY: &str = "current_profile_id";
+
+/// 项目 Profile 记录
+#[derive(Debug, Clone)]
+pub struct Profile {
+    pub id: String,
+    pub name: String,
+    /// 原始 JSON 快照文本（ProfilePayload），解析在 service 层
+    pub payload: String,
+    pub sort_order: Option<i64>,
+    pub created_at: Option<i64>,
+    pub updated_at: Option<i64>,
+}
+
+impl Database {
+    /// 获取所有项目（按 sort_order 优先、created_at 兜底排序）
+    pub fn get_all_profiles(&self) -> Result<Vec<Profile>, AppError> {
+        let conn = lock_conn!(self.conn);
+        let mut stmt = conn
+            .prepare(
+                "SELECT id, name, payload, sort_order, created_at, updated_at
+                 FROM profiles
+                 ORDER BY sort_order IS NULL, sort_order, created_at, id",
+            )
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        let rows = stmt
+            .query_map([], |row| {
+                Ok(Profile {
+                    id: row.get(0)?,
+                    name: row.get(1)?,
+                    payload: row.get(2)?,
+                    sort_order: row.get(3)?,
+                    created_at: row.get(4)?,
+                    updated_at: row.get(5)?,
+                })
+            })
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        let mut profiles = Vec::new();
+        for row in rows {
+            profiles.push(row.map_err(|e| AppError::Database(e.to_string()))?);
+        }
+        Ok(profiles)
+    }
+
+    /// 获取单个项目
+    pub fn get_profile(&self, id: &str) -> Result<Option<Profile>, AppError> {
+        let conn = lock_conn!(self.conn);
+        let mut stmt = conn
+            .prepare(
+                "SELECT id, name, payload, sort_order, created_at, updated_at
+                 FROM profiles WHERE id = ?1",
+            )
+            .map_err(|e| AppError::Database(e.to_string()))?;
+
+        match stmt.query_row(params![id], |row| {
+            Ok(Profile {
+                id: row.get(0)?,
+                name: row.get(1)?,
+                payload: row.get(2)?,
+                sort_order: row.get(3)?,
+                created_at: row.get(4)?,
+                updated_at: row.get(5)?,
+            })
+        }) {
+            Ok(profile) => Ok(Some(profile)),
+            Err(rusqlite::Error::QueryReturnedNoRows) => Ok(None),
+            Err(e) => Err(AppError::Database(e.to_string())),
+        }
+    }
+
+    /// 保存项目（插入或整行替换）
+    pub fn save_profile(&self, profile: &Profile) -> Result<(), AppError> {
+        let conn = lock_conn!(self.conn);
+        conn.execute(
+            "INSERT OR REPLACE INTO profiles
+             (id, name, payload, sort_order, created_at, updated_at)
+             VALUES (?1, ?2, ?3, ?4, ?5, ?6)",
+            params![
+                profile.id,
+                profile.name,
+                profile.payload,
+                profile.sort_order,
+                profile.created_at,
+                profile.updated_at,
+            ],
+        )
+        .map_err(|e| AppError::Database(e.to_string()))?;
+        Ok(())
+    }
+
+    /// 删除项目，返回是否实际删除了记录
+    pub fn delete_profile(&self, id: &str) -> Result<bool, AppError> {
+        let conn = lock_conn!(self.conn);
+        let affected = conn
+            .execute("DELETE FROM profiles WHERE id = ?1", params![id])
+            .map_err(|e| AppError::Database(e.to_string()))?;
+        Ok(affected > 0)
+    }
+
+    /// 读取当前激活的项目 id（未使用项目时为 None）
+    pub fn get_current_profile_id(&self) -> Result<Option<String>, AppError> {
+        self.get_setting(CURRENT_PROFILE_ID_KEY)
+    }
+
+    /// 设置当前激活的项目 id；None 表示"不使用项目"（删除 key）
+    pub fn set_current_profile_id(&self, id: Option<&str>) -> Result<(), AppError> {
+        match id {
+            Some(id) => self.set_setting(CURRENT_PROFILE_ID_KEY, id),
+            None => {
+                let conn = lock_conn!(self.conn);
+                conn.execute(
+                    "DELETE FROM settings WHERE key = ?1",
+                    params![CURRENT_PROFILE_ID_KEY],
+                )
+                .map_err(|e| AppError::Database(e.to_string()))?;
+                Ok(())
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn sample(id: &str, name: &str, sort_order: Option<i64>) -> Profile {
+        Profile {
+            id: id.to_string(),
+            name: name.to_string(),
+            payload: r#"{"providers":{"claude":null,"codex":null}}"#.to_string(),
+            sort_order,
+            created_at: Some(1_000),
+            updated_at: Some(1_000),
+        }
+    }
+
+    #[test]
+    fn test_profile_crud_roundtrip() -> Result<(), AppError> {
+        let db = Database::memory()?;
+
+        db.save_profile(&sample("a", "Dev", Some(2)))?;
+        db.save_profile(&sample("b", "Draw", Some(1)))?;
+        db.save_profile(&sample("c", "Misc", None))?;
+
+        // sort_order 优先，NULL 排最后
+        let all = db.get_all_profiles()?;
+        assert_eq!(
+            all.iter().map(|p| p.id.as_str()).collect::<Vec<_>>(),
+            vec!["b", "a", "c"]
+        );
+
+        let got = db.get_profile("a")?.expect("profile a exists");
+        assert_eq!(got.name, "Dev");
+        assert!(got.payload.contains("providers"));
+
+        // 整行替换更新
+        let mut updated = sample("a", "Dev Renamed", Some(2));
+        updated.updated_at = Some(2_000);
+        db.save_profile(&updated)?;
+        let got = db.get_profile("a")?.expect("profile a exists");
+        assert_eq!(got.name, "Dev Renamed");
+        assert_eq!(got.updated_at, Some(2_000));
+
+        assert!(db.delete_profile("a")?);
+        assert!(!db.delete_profile("a")?);
+        assert!(db.get_profile("a")?.is_none());
+        Ok(())
+    }
+
+    #[test]
+    fn test_current_profile_id_set_and_clear() -> Result<(), AppError> {
+        let db = Database::memory()?;
+
+        assert_eq!(db.get_current_profile_id()?, None);
+        db.set_current_profile_id(Some("a"))?;
+        assert_eq!(db.get_current_profile_id()?, Some("a".to_string()));
+        db.set_current_profile_id(None)?;
+        assert_eq!(db.get_current_profile_id()?, None);
+        // 重复清除应幂等
+        db.set_current_profile_id(None)?;
+        assert_eq!(db.get_current_profile_id()?, None);
+        Ok(())
+    }
+}