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>

LittleShop/Services/ITeleBotMessagingService.cs

@@ -0,0 +1,16 @@
+using LittleShop.Enums;
+
+namespace LittleShop.Services;
+
+public interface ITeleBotMessagingService
+{
+    Task<bool> SendOrderStatusUpdateAsync(Guid orderId, OrderStatus newStatus);
+    Task<bool> SendPaymentConfirmedAsync(Guid orderId);
+    Task<bool> SendOrderAcceptedAsync(Guid orderId);
+    Task<bool> SendOrderPackingAsync(Guid orderId);
+    Task<bool> SendOrderDispatchedAsync(Guid orderId, string? trackingNumber = null);
+    Task<bool> SendOrderDeliveredAsync(Guid orderId);
+    Task<bool> SendOrderOnHoldAsync(Guid orderId, string? reason = null);
+    Task<bool> SendTestMessageAsync(Guid customerId, string message);
+    Task<bool> IsAvailableAsync();
+}