wip: additional services with constraints

src/Form/Service/ParticipantAssignedRoomFieldHandler.php

@@ -71,4 +71,4 @@ class ParticipantAssignedRoomFieldHandler extends AbstractParticipantFieldHandle
         // Convert form string to integer, handling empty selections as null
         $participant->assignedRoomId = $this->normalizeIntValue($roomId);
     }
-}
+}