Add asset import/export and local dev server setup

- Configure Vite dev server with localhost binding and public asset proxy
- Add npm scripts for concurrent Laravel/Vite development (dev:local, dev:test)
- Implement asset import/export in ACP via ZIP file upload/download
- Create AssetController for asset management endpoints
- Add asset management UI tab in admin panel

package.json

@@ -9,6 +9,8 @@
     "scripts": {
         "build": "vite build",
         "dev": "vite",
+        "dev:local": "concurrently -n app,vite -c blue,magenta \"php artisan serve --host=127.0.0.1\" \"vite\"",
+        "dev:test": "concurrently -n app,vite -c blue,magenta \"php artisan serve --host=127.0.0.1\" \"vite --host 127.0.0.1 --port 5173\"",
         "watch": "vite build --watch",
         "lint": "eslint ."
     },