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/settings.service.ts

@@ -79,19 +79,19 @@ export interface SystemStatus {
 export const settingsService = {
   // Get all settings
   async getAllSettings(): Promise<Record<string, any>> {
-    const response = await api.get<Record<string, any>>('/api/admin/settings');
+    const response = await api.get<Record<string, any>>('/admin/settings');
     return response.data;
   },
 
   // Get settings by type
   async getSettingsByType(type: 'branding' | 'theme' | 'general'): Promise<Record<string, any>> {
-    const response = await api.get<Record<string, any>>(`/api/admin/settings/${type}`);
+    const response = await api.get<Record<string, any>>(`/admin/settings/${type}`);
     return response.data;
   },
 
   // Update branding settings
   async updateBranding(settings: BrandingSettings): Promise<void> {
-    await api.put('/api/admin/settings/branding', settings);
+    await api.put('/admin/settings/branding', settings);
   },
 
   // Upload logo
@@ -150,23 +150,23 @@ export const settingsService = {
 
   // Update theme settings
   async updateTheme(settings: ThemeSettings): Promise<void> {
-    await api.put('/api/admin/settings/theme', settings);
+    await api.put('/admin/settings/theme', settings);
   },
 
   // Update multiple settings at once
   async updateSettings(settings: Record<string, any>): Promise<void> {
-    await api.put('/api/admin/settings/general', settings);
+    await api.put('/admin/settings/general', settings);
   },
 
   // Get storage information
   async getStorageInfo(): Promise<StorageInfo> {
-    const response = await api.get<StorageInfo>('/api/admin/settings/storage/info');
+    const response = await api.get<StorageInfo>('/admin/settings/storage/info');
     return response.data;
   },
 
   // Get system status
   async getSystemStatus(): Promise<SystemStatus> {
-    const response = await api.get<SystemStatus>('/api/admin/system/status');
+    const response = await api.get<SystemStatus>('/admin/system/status');
     return response.data;
   },