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

routes/api.php

@@ -1,5 +1,6 @@
 <?php
 
+use App\Http\Controllers\AssetController;
 use App\Http\Controllers\AttachmentController;
 use App\Http\Controllers\AttachmentExtensionController;
 use App\Http\Controllers\AttachmentGroupController;
@@ -53,6 +54,8 @@ Route::post('/user-settings', [UserSettingController::class, 'store'])->middlewa
 Route::post('/uploads/logo', [UploadController::class, 'storeLogo'])->middleware('auth:sanctum');
 Route::post('/uploads/favicon', [UploadController::class, 'storeFavicon'])->middleware('auth:sanctum');
 Route::post('/user/avatar', [UploadController::class, 'storeAvatar'])->middleware('auth:sanctum');
+Route::get('/assets/export', [AssetController::class, 'export'])->middleware('auth:sanctum');
+Route::post('/assets/import', [AssetController::class, 'import'])->middleware('auth:sanctum');
 Route::get('/i18n/{locale}', I18nController::class);
 Route::get('/users', [UserController::class, 'index'])->middleware('auth:sanctum');
 Route::patch('/users/{user}', [UserController::class, 'update'])->middleware('auth:sanctum');