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/BotContactService.cs

@@ -7,12 +7,13 @@ using Microsoft.Extensions.Logging;
 using LittleShop.Data;
 using LittleShop.Models;
 using LittleShop.DTOs;
+using LittleShop.Enums;
 
 namespace LittleShop.Services;
 
 public interface IMessageDeliveryService
 {
-    // Placeholder interface for compilation
+    Task<bool> QueueRecoveryMessageAsync(long telegramUserId, string message);
 }
 
 public interface IBotContactService