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/schema.rs

@@ -295,6 +295,20 @@ impl Database {
         )
         .map_err(|e| AppError::Database(e.to_string()))?;
 
+        // 19. Profiles 表（项目配置方案：按 app 快照供应商/MCP/Skills/Prompt）
+        conn.execute(
+            "CREATE TABLE IF NOT EXISTS profiles (
+                id TEXT PRIMARY KEY,
+                name TEXT NOT NULL,
+                payload TEXT NOT NULL,
+                sort_order INTEGER,
+                created_at INTEGER,
+                updated_at INTEGER
+            )",
+            [],
+        )
+        .map_err(|e| AppError::Database(e.to_string()))?;
+
         // 尝试添加 live_takeover_active 列到 proxy_config 表
         let _ = conn.execute(
             "ALTER TABLE proxy_config ADD COLUMN live_takeover_active INTEGER NOT NULL DEFAULT 0",
@@ -444,6 +458,11 @@ impl Database {
                         Self::migrate_v10_to_v11(conn)?;
                         Self::set_user_version(conn, 11)?;
                     }
+                    11 => {
+                        log::info!("迁移数据库从 v11 到 v12（添加项目 Profiles 表）");
+                        Self::migrate_v11_to_v12(conn)?;
+                        Self::set_user_version(conn, 12)?;
+                    }
                     _ => {
                         return Err(AppError::Database(format!(
                             "未知的数据库版本 {version}，无法迁移到 {SCHEMA_VERSION}"
@@ -1270,6 +1289,24 @@ impl Database {
         Ok(())
     }
 
+    /// v11 -> v12 迁移：添加项目 Profiles 表
+    /// 与 create_tables_on_conn 中的建表语句保持一致（IF NOT EXISTS 保证幂等）
+    fn migrate_v11_to_v12(conn: &Connection) -> Result<(), AppError> {
+        conn.execute(
+            "CREATE TABLE IF NOT EXISTS profiles (
+                id TEXT PRIMARY KEY,
+                name TEXT NOT NULL,
+                payload TEXT NOT NULL,
+                sort_order INTEGER,
+                created_at INTEGER,
+                updated_at INTEGER
+            )",
+            [],
+        )
+        .map_err(|e| AppError::Database(format!("v11 -> v12 创建 profiles 表失败: {e}")))?;
+        Ok(())
+    }
+
     /// 插入默认模型定价数据
     /// 格式: (model_id, display_name, input, output, cache_read, cache_creation)
     /// 注意: model_id 使用短横线格式（如 claude-haiku-4-5），与 API 返回的模型名称标准化后一致