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/gallery.service.ts

@@ -4,26 +4,26 @@ import type { GalleryInfo, GalleryData, GalleryStats } from '../types';
 export const galleryService = {
   // Verify share token
   async verifyToken(slug: string, token: string): Promise<{ valid: boolean }> {
-    const response = await api.get<{ valid: boolean }>(`/api/gallery/${slug}/verify-token/${token}`);
+    const response = await api.get<{ valid: boolean }>(`/gallery/${slug}/verify-token/${token}`);
     return response.data;
   },
 
   // Get basic gallery info (no auth required)
   async getGalleryInfo(slug: string, token?: string): Promise<GalleryInfo> {
     const params = token ? { token } : {};
-    const response = await api.get<GalleryInfo>(`/api/gallery/${slug}/info`, { params });
+    const response = await api.get<GalleryInfo>(`/gallery/${slug}/info`, { params });
     return response.data;
   },
 
   // Get gallery photos (requires auth)
   async getGalleryPhotos(slug: string): Promise<GalleryData> {
-    const response = await api.get<GalleryData>(`/api/gallery/${slug}/photos`);
+    const response = await api.get<GalleryData>(`/gallery/${slug}/photos`);
     return response.data;
   },
 
   // Download single photo
   async downloadPhoto(slug: string, photoId: number, filename: string): Promise<void> {
-    const response = await api.get(`/api/gallery/${slug}/download/${photoId}`, {
+    const response = await api.get(`/gallery/${slug}/download/${photoId}`, {
       responseType: 'blob',
     });
 
@@ -40,7 +40,7 @@ export const galleryService = {
 
   // Download all photos as ZIP
   async downloadAllPhotos(slug: string): Promise<void> {
-    const response = await api.get(`/api/gallery/${slug}/download-all`, {
+    const response = await api.get(`/gallery/${slug}/download-all`, {
       responseType: 'blob',
     });
 
@@ -57,7 +57,7 @@ export const galleryService = {
 
   // Get gallery statistics
   async getGalleryStats(slug: string): Promise<GalleryStats> {
-    const response = await api.get<GalleryStats>(`/api/gallery/${slug}/stats`);
+    const response = await api.get<GalleryStats>(`/gallery/${slug}/stats`);
     return response.data;
   },
 };