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/admin.service.ts

@@ -66,13 +66,13 @@ export interface AnalyticsData {
 export const adminService = {
   // Dashboard statistics
   async getDashboardStats(): Promise<DashboardStats> {
-    const response = await api.get<DashboardStats>('/api/admin/dashboard/stats');
+    const response = await api.get<DashboardStats>('/admin/dashboard/stats');
     return response.data;
   },
 
   // Recent activity
   async getRecentActivity(limit: number = 10): Promise<Activity[]> {
-    const response = await api.get<Activity[]>('/api/admin/dashboard/activity', {
+    const response = await api.get<Activity[]>('/admin/dashboard/activity', {
       params: { limit }
     });
     return response.data;
@@ -80,7 +80,7 @@ export const adminService = {
 
   // Analytics data
   async getAnalytics(days: number = 7): Promise<AnalyticsData> {
-    const response = await api.get<AnalyticsData>('/api/admin/dashboard/analytics', {
+    const response = await api.get<AnalyticsData>('/admin/dashboard/analytics', {
       params: { days }
     });
     return response.data;
@@ -88,7 +88,7 @@ export const adminService = {
 
   // System health check
   async getSystemHealth(): Promise<SystemHealth> {
-    const response = await api.get<SystemHealth>('/api/admin/dashboard/health');
+    const response = await api.get<SystemHealth>('/admin/dashboard/health');
     return response.data;
   },
 
@@ -124,6 +124,6 @@ export const adminService = {
 
   // Change password
   async changePassword(data: { currentPassword: string; newPassword: string }): Promise<void> {
-    await api.post('/api/admin/auth/change-password', data);
+    await api.post('/admin/auth/change-password', data);
   }
 };