Implement comprehensive notification system for LittleShop

- Add admin PWA push notifications for order management
- Integrate TeleBot customer messaging service
- Add push notification endpoints and VAPID key support
- Implement order status notifications throughout workflow
- Add notification UI components in admin panel
- Create TeleBotMessagingService for customer updates
- Add WebPush configuration to appsettings
- Fix compilation issues (BotStatus, BotContacts DbSet)
- Add comprehensive testing documentation

Features:
- Real-time admin notifications for new orders and status changes
- Customer order progress updates via TeleBot
- Graceful failure handling for notification services
- Test endpoints for notification system validation

🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>

.env.production.template

@@ -17,6 +17,10 @@ BTCPAY_WEBHOOK_SECRET=your-webhook-secret
 # LOG_LEVEL=Information
 # LOG_RETENTION_DAYS=30
 
+# TeleBot Integration (for customer order notifications)
+TELEBOT_API_URL=https://your-telebot-instance.com
+TELEBOT_API_KEY=your-telebot-api-key
+
 # Optional: Application Configuration
 # ASPNETCORE_ENVIRONMENT=Production
 # ALLOWED_HOSTS=littleshop.silverlabs.uk