refactor: move backend in apps/backend

apps/backend/routes/notifications.php

@@ -0,0 +1,12 @@
+<?php
+
+use apps\backend\app\Http\Controllers\NotificationsController;
+use Illuminate\Support\Facades\Route;
+
+Route::middleware(['web', 'auth:sanctum'])->get('/users/notifications', [NotificationsController::class, "getNotifications"]);
+
+Route::middleware(['web', 'auth:sanctum'])->delete('/users/delete/notification/{notificationId}', [NotificationsController::class, 'deleteNotification'])
+    ->whereUuid('notificationId');
+
+Route::middleware(['web', 'auth:sanctum'])->post('/users/notifications/read', [NotificationsController::class, "readNotifications"]);
+