feat: integrate Tauri v2 with Android widget and voice assistant

- Add Tauri v2 shell (Cargo, tauri.conf.json, capabilities, plugins)
- Migrate all fetch() calls to apiFetch() for Tauri-aware HTTP
- Migrate WebSocket endpoints to resolveEndpoints() for dynamic URLs
- Add ServerConfigDialog for remote server URL configuration
- Add tauri.ts lib with isTauri detection, apiFetch wrapper, plugin helpers
- Add server-config Pinia store with persistence via plugin-store
- Conditional PWA (disabled in Tauri builds)
- Android: home screen transcript widget (last 5 messages, 30s refresh)
- Android: voice command / share activity (SpeechRecognizer + WebSocket)
- Android: signed release APK with auto-copy to installers/
- Remove stale frontend/src-tauri directory

frontend/package.json

@@ -8,10 +8,25 @@
     "dev": "vite",
     "build": "vue-tsc -b && vite build",
     "preview": "vite preview",
-    "generate-icons": "node scripts/generate-icons.js"
+    "generate-icons": "node scripts/generate-icons.js",
+    "tauri": "tauri",
+    "tauri:dev": "tauri dev",
+    "tauri:build": "tauri build",
+    "tauri:android:init": "tauri android init",
+    "tauri:android:dev": "tauri android dev",
+    "tauri:android:build": "tauri android build",
+    "tauri:ios:init": "tauri ios init",
+    "tauri:ios:dev": "tauri ios dev",
+    "tauri:ios:build": "tauri ios build"
   },
   "dependencies": {
     "@nucleoriofrio/webmcp": "git+https://gitea.nucleoriofrio.com/nucleo000/webmcp.git",
+    "@tauri-apps/api": "^2.10.1",
+    "@tauri-apps/plugin-clipboard-manager": "^2.3.2",
+    "@tauri-apps/plugin-dialog": "^2.6.0",
+    "@tauri-apps/plugin-http": "^2.5.7",
+    "@tauri-apps/plugin-notification": "^2.3.3",
+    "@tauri-apps/plugin-store": "^2.4.2",
     "@xterm/addon-fit": "^0.11.0",
     "@xterm/addon-web-links": "^0.12.0",
     "@xterm/addon-webgl": "^0.19.0",
@@ -22,6 +37,7 @@
     "vue-router": "^4.6.4"
   },
   "devDependencies": {
+    "@tauri-apps/cli": "^2.10.0",
     "@types/node": "^24.10.1",
     "@vitejs/plugin-vue": "^6.0.2",
     "@vue/tsconfig": "^0.8.1",