format: fix psr12 style issues

phpcbf auto-fixes: string concatenation spacing, single-line class braces, closing brace placement.

backend/app/Auth/UseCases/AuthenticateUser/AuthenticateUser.php

@@ -14,7 +14,8 @@ class AuthenticateUser
     public function __construct(
         private UserRepository $userRepo,
         private PasswordHasher $hasher,
-    ) {}
+    ) {
+    }
 
     /**
      * @throws BadRequestException

backend/app/Auth/UseCases/AuthenticateUser/AuthenticateUserRequest.php

@@ -7,5 +7,6 @@ class AuthenticateUserRequest
     public function __construct(
         public ?string $email,
         public ?string $password,
-    ) {}
+    ) {
+    }
 }