feat(phase1): architecture skeleton

- Electron 33 main process with frameless window, IPC, win-state persistence
- Preload with contextBridge typed API (window, theme, dialog)
- Vue 3 + Pinia + Element Plus + Vue Router renderer
- Dark/light dual theme via CSS custom properties
- TitleBar with window controls + theme toggle
- StatusBar placeholder
- Design spec document

package.json

@@ -18,7 +18,8 @@
     "lint": "eslint . --ext .js,.jsx,.ts,.tsx,.vue --fix"
   },
   "dependencies": {
-    "ioredis": "^5.7.0"
+    "ioredis": "^5.7.0",
+    "pinia": "^3.0.4"
   },
   "devDependencies": {
     "@vitejs/plugin-vue": "^5.2.0",