Refactor Base64 encoding/decoding methods for consistency, update controller routes, and improve CI configuration

src/Controller/LoginController.php

@@ -6,9 +6,11 @@ namespace App\Controller;
 
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Attribute\AsController;
 use Symfony\Component\Routing\Attribute\Route;
 use Symfony\Component\Security\Http\Authentication\AuthenticationUtils;
 
+#[AsController]
 class LoginController extends AbstractController
 {
     #[Route(path: '/login', name: 'app_login_login')]