feat: refactor callback validators to dedicated class

src/Validator/Constraints/Booking.php

@@ -7,7 +7,7 @@ use Symfony\Component\Validator\Constraint;
 #[\Attribute]
 class Booking extends Constraint
 {
-    public string $message = 'WTF?';
+    public string $message = 'Bitte prüfe deine Angaben.';
 
     public function getTargets(): array|string
     {