Refactor association keys in setupAssociations: Update foreign key naming conventions in Party and TitleOfNobility associations for consistency and clarity. Enhance error handling in FalukantService to ensure party ID is present before adding invited nobilities.

backend/services/falukantService.js

@@ -3225,6 +3225,10 @@ class FalukantService extends BaseService {
             cost: cost
         });
         if (nobilities.length > 0) {
+            // Stelle sicher, dass die Party eine ID hat
+            if (!party.id) {
+                throw new Error('Party wurde erstellt, hat aber keine ID');
+            }
             // Verwende die bereits geladenen Objekte
             await party.addInvitedNobilities(nobilities);
         }