fix: resolve reordering API routing issue

🔧 Problem identified and fixed:
- nginx proxy was routing /api/groups to /groups (removing /api prefix)
- Backend route was registered under /api/groups instead of /groups
- Changed backend route registration from '/api/groups' to '/groups'
- Tested API endpoint: curl to /api/groups/qion_-lT1/reorder now works
- Removed debug console.log statements for cleaner production code

✅ Drag-and-drop reordering now functional in ModerationGroupImagesPage
✅ API requests properly routed through nginx proxy to backend
✅ Error 'Reihenfolge konnte nicht geändert werden' resolved

backend/src/routes/index.js

@@ -7,7 +7,7 @@ const reorderRouter = require('./reorder');
 
 const renderRoutes = (app) => {
     [uploadRouter, downloadRouter, batchUploadRouter, groupsRouter, migrationRouter].forEach(router => app.use('/', router));
-    app.use('/api/groups', reorderRouter);
+    app.use('/groups', reorderRouter);
 };
 
 module.exports = { renderRoutes };

frontend/src/Components/Pages/ModerationGroupImagesPage.js

@@ -132,7 +132,7 @@ const ModerationGroupImagesPage = () => {
 
         try {
             setIsReordering(true);
-            console.log('🔄 Reordering images:', reorderedItems.map(img => ({ id: img.id, fileName: img.fileName })));
+            const imageIds = reorderedItems.map(img => img.id);
             
             // Update local state immediately (optimistic update)
             setSelectedImages(reorderedItems);
@@ -143,7 +143,7 @@ const ModerationGroupImagesPage = () => {
             }
             
             // Send API request
-            await updateImageOrder(groupId, reorderedItems.map(img => img.id));
+            await updateImageOrder(groupId, imageIds);
             
             // Show success feedback
             Swal.fire({

frontend/src/services/reorderService.js

@@ -111,8 +111,8 @@ const reorderService = new ReorderService();
 
 export default reorderService;
 
-// Named exports for easier testing
-export const updateImageOrder = reorderService.updateImageOrder.bind(reorderService);
-export const validateImageIds = reorderService.validateImageIds.bind(reorderService);
-export const extractImageIds = reorderService.extractImageIds.bind(reorderService);
-export const reorderArray = reorderService.reorderArray.bind(reorderService);
+// Named exports for easier testing  
+export const updateImageOrder = (groupId, imageIds) => reorderService.updateImageOrder(groupId, imageIds);
+export const validateImageIds = (images, imageIds) => reorderService.validateImageIds(images, imageIds);
+export const extractImageIds = (images) => reorderService.extractImageIds(images);
+export const reorderArray = (items, startIndex, endIndex) => reorderService.reorderArray(items, startIndex, endIndex);