add admin login page at /login

backend/config/routes.php

@@ -2,11 +2,14 @@
 
 use App\Controllers\AuthController;
 use App\Middleware\AuthMiddleware;
+use App\Middleware\CorsMiddleware;
 use Slim\App;
 use Slim\Routing\RouteCollectorProxy;
 
 return function (App $app): void {
 
+    $app->add(CorsMiddleware::class);
+
     $app->get('/me', [AuthController::class, 'me'])
         ->add(AuthMiddleware::class);