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/CryptoPaymentService.cs

@@ -14,17 +14,23 @@ public class CryptoPaymentService : ICryptoPaymentService
     private readonly IBTCPayServerService _btcPayService;
     private readonly ILogger<CryptoPaymentService> _logger;
     private readonly IConfiguration _configuration;
+    private readonly IPushNotificationService _pushNotificationService;
+    private readonly ITeleBotMessagingService _teleBotMessagingService;
 
     public CryptoPaymentService(
         LittleShopContext context,
         IBTCPayServerService btcPayService,
         ILogger<CryptoPaymentService> logger,
-        IConfiguration configuration)
+        IConfiguration configuration,
+        IPushNotificationService pushNotificationService,
+        ITeleBotMessagingService teleBotMessagingService)
     {
         _context = context;
         _btcPayService = btcPayService;
         _logger = logger;
         _configuration = configuration;
+        _pushNotificationService = pushNotificationService;
+        _teleBotMessagingService = teleBotMessagingService;
     }
 
     public async Task<CryptoPaymentDto> CreatePaymentAsync(Guid orderId, CryptoCurrency currency)
@@ -157,9 +163,11 @@ public class CryptoPaymentService : ICryptoPaymentService
         if (status == PaymentStatus.Paid)
         {
             payment.PaidAt = DateTime.UtcNow;
-            
+
             // Update order status
-            var order = await _context.Orders.FindAsync(payment.OrderId);
+            var order = await _context.Orders
+                .Include(o => o.Customer)
+                .FirstOrDefaultAsync(o => o.Id == payment.OrderId);
             if (order != null)
             {
                 order.Status = OrderStatus.PaymentReceived;
@@ -169,7 +177,13 @@ public class CryptoPaymentService : ICryptoPaymentService
 
         await _context.SaveChangesAsync();
 
-        _logger.LogInformation("Processed payment webhook for invoice {InvoiceId}, status: {Status}", 
+        // Send notification for payment confirmation
+        if (status == PaymentStatus.Paid)
+        {
+            await SendPaymentConfirmedNotification(payment.OrderId, amount);
+        }
+
+        _logger.LogInformation("Processed payment webhook for invoice {InvoiceId}, status: {Status}",
             invoiceId, status);
 
         return true;
@@ -209,4 +223,25 @@ public class CryptoPaymentService : ICryptoPaymentService
             _ => "BTC"
         };
     }
+
+    private async Task SendPaymentConfirmedNotification(Guid orderId, decimal amount)
+    {
+        try
+        {
+            var title = "💰 Payment Confirmed";
+            var body = $"Order #{orderId.ToString()[..8]} payment of £{amount:F2} confirmed. Ready for acceptance.";
+
+            // Send push notification to admin users
+            await _pushNotificationService.SendOrderNotificationAsync(orderId, title, body);
+
+            // Send TeleBot message to customer
+            await _teleBotMessagingService.SendPaymentConfirmedAsync(orderId);
+
+            _logger.LogInformation("Sent payment confirmation notifications for order {OrderId} (Admin + Customer)", orderId);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to send payment confirmation notification for order {OrderId}", orderId);
+        }
+    }
 }