Implement complete frontend with admin panel and theme system

- Add admin authentication and dashboard
- Create event management pages (list, create, edit, archive)
- Implement gallery enhancements (search, sorting, bulk download)
- Add email configuration and archive management pages
- Integrate Umami analytics with tracking throughout the app
- Add comprehensive error boundaries and loading states
- Implement accessibility features (WCAG 2.1 AA compliance)
- Create theme system with preset themes and customization
- Add branding settings and company information management
- Fix backend database initialization and health check
- Configure proper API URLs and environment variables

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

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/.env.example

@@ -0,0 +1,11 @@
+# Backend API URL
+VITE_API_URL=http://localhost:3001
+
+# Umami Analytics Configuration
+# Get these values from your Umami installation
+VITE_UMAMI_URL=https://analytics.yourdomain.com
+VITE_UMAMI_WEBSITE_ID=your-website-id-from-umami
+
+# Optional: Umami share URL for embedding full dashboard
+# This is the public share URL from Umami's share feature
+VITE_UMAMI_SHARE_URL=https://analytics.yourdomain.com/share/your-share-id/photo-sharing