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/Program.cs

@@ -84,9 +84,12 @@ builder.Services.AddScoped<IReviewService, ReviewService>();
 builder.Services.AddScoped<IDataSeederService, DataSeederService>();
 builder.Services.AddScoped<IBotService, BotService>();
 builder.Services.AddScoped<IBotMetricsService, BotMetricsService>();
+builder.Services.AddScoped<IBotContactService, BotContactService>();
+builder.Services.AddScoped<IMessageDeliveryService, MessageDeliveryService>();
 builder.Services.AddScoped<ICustomerService, CustomerService>();
 builder.Services.AddScoped<ICustomerMessageService, CustomerMessageService>();
 builder.Services.AddScoped<IPushNotificationService, PushNotificationService>();
+builder.Services.AddHttpClient<ITeleBotMessagingService, TeleBotMessagingService>();
 builder.Services.AddScoped<IProductImportService, ProductImportService>();
 builder.Services.AddSingleton<ITelegramBotManagerService, TelegramBotManagerService>();