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 <noreply@anthropic.com>

frontend/src/services/cms.service.ts

@@ -13,25 +13,25 @@ export interface CMSPage {
 export const cmsService = {
   // Get all CMS pages
   async getPages(): Promise<CMSPage[]> {
-    const response = await api.get<CMSPage[]>('/api/admin/cms/pages');
+    const response = await api.get<CMSPage[]>('/admin/cms/pages');
     return response.data;
   },
 
   // Get a single CMS page
   async getPage(slug: string): Promise<CMSPage> {
-    const response = await api.get<CMSPage>(`/api/admin/cms/pages/${slug}`);
+    const response = await api.get<CMSPage>(`/admin/cms/pages/${slug}`);
     return response.data;
   },
 
   // Update a CMS page
   async updatePage(slug: string, data: Partial<CMSPage>): Promise<CMSPage> {
-    const response = await api.put<CMSPage>(`/api/admin/cms/pages/${slug}`, data);
+    const response = await api.put<CMSPage>(`/admin/cms/pages/${slug}`, data);
     return response.data;
   },
 
   // Get public CMS page (no auth required)
   async getPublicPage(slug: string, lang: string = 'en'): Promise<{ title: string; content: string }> {
-    const response = await api.get<{ title: string; content: string }>(`/api/public/pages/${slug}`, {
+    const response = await api.get<{ title: string; content: string }>(`/public/pages/${slug}`, {
       params: { lang }
     });
     return response.data;