fix wrong namespace use

apps/backend/routes/api.php

@@ -1,7 +1,7 @@
 <?php
 
 use App\Http\Controllers\ProfilePhotoController;
-use apps\backend\app\Http\Controllers\ExportController;
+use app\Http\Controllers\ExportController;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Route;