fix: resolve frontend API routing issues for Traefik deployment

Major fixes for production deployment with Traefik:

1. API Path Fixes:
   - Remove double /api prefix from all frontend service calls
   - Fix auth.service.ts to use correct paths (/auth/admin/login)
   - Update all services to use single /api prefix from base URL
   - Fix template literal paths in photo services

2. Docker Configuration:
   - Add build args for VITE_API_URL in docker-compose.prod.yml
   - Create Dockerfile.prod with proper API URL configuration
   - Ensure frontend is built with correct API base path

3. Documentation:
   - Add comprehensive TRAEFIK_DEPLOYMENT.md guide
   - Document proper Traefik labels and routing configuration
   - Include troubleshooting steps for common issues
   - Explain network configuration and SSL handling

This resolves:
- 502 Bad Gateway errors
- Double /api/api paths in requests
- Frontend unable to communicate with backend
- Login functionality not working

The frontend now correctly calls the backend API through Traefik's
routing, with all requests going to /api/* being forwarded to the
backend service on port 3000.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

frontend/src/services/photos.service.ts

@@ -39,7 +39,7 @@ class PhotosService {
     }
     
     const queryString = params.toString();
-    const url = `/api/admin/events/${eventId}/photos${queryString ? `?${queryString}` : ''}`;
+    const url = `/admin/events/${eventId}/photos${queryString ? `?${queryString}` : ''}`;
     
     const response = await api.get(url);
     
@@ -48,26 +48,26 @@ class PhotosService {
   }
 
   async deletePhoto(eventId: number, photoId: number): Promise<void> {
-    await api.delete(`/api/admin/events/${eventId}/photos/${photoId}`);
+    await api.delete(`/admin/events/${eventId}/photos/${photoId}`);
   }
 
   async deletePhotos(eventId: number, photoIds: number[]): Promise<void> {
-    await api.post(`/api/admin/events/${eventId}/photos/bulk-delete`, { photoIds });
+    await api.post(`/admin/events/${eventId}/photos/bulk-delete`, { photoIds });
   }
 
   async updatePhotoCategory(eventId: number, photoId: number, categoryId: number | null): Promise<void> {
-    await api.patch(`/api/admin/events/${eventId}/photos/${photoId}`, { category_id: categoryId });
+    await api.patch(`/admin/events/${eventId}/photos/${photoId}`, { category_id: categoryId });
   }
 
   async updatePhotosCategory(eventId: number, photoIds: number[], categoryId: number | null): Promise<void> {
-    await api.post(`/api/admin/events/${eventId}/photos/bulk-update`, { 
+    await api.post(`/admin/events/${eventId}/photos/bulk-update`, { 
       photoIds, 
       updates: { category_id: categoryId }
     });
   }
 
   async downloadPhoto(eventId: number, photoId: number, filename: string): Promise<void> {
-    const response = await api.get(`/api/admin/events/${eventId}/photos/${photoId}/download`, {
+    const response = await api.get(`/admin/events/${eventId}/photos/${photoId}/download`, {
       responseType: 'blob'
     });