Refine city filtering in NPC creation process within AdminService

- Added explicit filtering for city-type regions to ensure only valid cities are processed during NPC creation.
- Enhanced logging to provide feedback on the number of cities found and their names, improving traceability in the NPC creation workflow.
- Updated comments for clarity on the importance of using city regions exclusively.

backend/services/adminService.js

@@ -1116,6 +1116,7 @@ class AdminService {
         } = options;
 
         // Berechne zuerst die Gesamtanzahl, um den Job richtig zu initialisieren
+        // WICHTIG: Nur Städte (city) verwenden, keine anderen Region-Typen
         let targetRegions = [];
         if (regionIds && regionIds.length > 0) {
             targetRegions = await RegionData.findAll({
@@ -1125,7 +1126,8 @@ class AdminService {
                 include: [{
                     model: RegionType,
                     as: 'regionType',
-                    where: { labelTr: 'city' }
+                    where: { labelTr: 'city' },
+                    required: true // INNER JOIN - nur Regionen mit city-Type
                 }]
             });
         } else {
@@ -1133,11 +1135,22 @@ class AdminService {
                 include: [{
                     model: RegionType,
                     as: 'regionType',
-                    where: { labelTr: 'city' }
+                    where: { labelTr: 'city' },
+                    required: true // INNER JOIN - nur Regionen mit city-Type
                 }]
             });
         }
 
+        // Zusätzliche Sicherheit: Filtere explizit nach city-Type
+        targetRegions = targetRegions.filter(region => {
+            return region.regionType && region.regionType.labelTr === 'city';
+        });
+
+        console.log(`[createNPCs] Found ${targetRegions.length} cities (filtered)`);
+        if (targetRegions.length > 0) {
+            console.log(`[createNPCs] City names: ${targetRegions.map(r => r.name).join(', ')}`);
+        }
+
         if (targetRegions.length === 0) {
             throw new Error('No cities found');
         }