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/App.tsx

@@ -58,6 +58,7 @@ import {
   DRAG_REGION_STYLE,
 } from "@/lib/platform";
 import { AppSwitcher } from "@/components/AppSwitcher";
+import { ProfileSwitcher } from "@/components/profiles/ProfileSwitcher";
 import { ProviderList } from "@/components/providers/ProviderList";
 import { AddProviderDialog } from "@/components/providers/AddProviderDialog";
 import { EditProviderDialog } from "@/components/providers/EditProviderDialog";
@@ -381,6 +382,13 @@ function App() {
     }
   });
 
+  // 托盘应用项目后刷新相关缓存（providers 由既有 provider-switched 监听承接）
+  useTauriEvent("profile-applied", async () => {
+    await queryClient.invalidateQueries({ queryKey: ["profiles"] });
+    await queryClient.invalidateQueries({ queryKey: ["mcp", "all"] });
+    await queryClient.invalidateQueries({ queryKey: ["skills"] });
+  });
+
   useTauriEvent<SyncStatusUpdatedPayload | null | undefined>(
     "webdav-sync-status-updated",
     async (payload) => {
@@ -1189,6 +1197,7 @@ function App() {
                     CC Switch
                   </a>
                 </div>
+                <ProfileSwitcher visibleApps={visibleApps} />
                 <Button
                   variant="ghost"
                   size="icon"