feat(payment): integrate TwentyCard payment option and enhance checkout flow

- Added a new payment method for TwentyCard in the checkout process, allowing users to select it alongside direct payment options.
- Implemented the logic for processing TwentyCard payments, including user feedback and dialog interactions for payment confirmation.
- Updated the appsettings files to include configuration for the new payment method.
- Enhanced the user interface in the PackagePurchaseDialog to reflect the new payment option and its requirements.

These changes improve the payment flexibility in the checkout process, providing users with additional options for completing their transactions.

src/FrontOffice.Main/Pages/Profile/Index.razor.cs

@@ -421,7 +421,10 @@ public partial class Index
             switch (purchase.Method)
             {
                 case Shared.PackagePurchaseDialog.PaymentMethodType.DirectPayment:
-                    await ProcessDirectPayment(purchase.Package.Id);
+                    await ProcessDirectPayment(purchase.Package.Id, gatewayProvider: null);
+                    break;
+                case Shared.PackagePurchaseDialog.PaymentMethodType.TwentyCard:
+                    await ProcessTwentyCardPayment(purchase.Package.Id);
                     break;
                 case Shared.PackagePurchaseDialog.PaymentMethodType.DayaLoan:
                     await ProcessDayaLoanPayment();
@@ -430,7 +433,25 @@ public partial class Index
         }
     }
 
-    private async Task ProcessDirectPayment(long packageId)
+    private async Task ProcessTwentyCardPayment(long packageId)
+    {
+        var options = new DialogOptions
+        {
+            MaxWidth = MaxWidth.Small,
+            FullWidth = true,
+            CloseOnEscapeKey = true,
+            BackdropClick = true
+        };
+
+        var dialog = await DialogService.ShowAsync<Shared.TwentyCardCreditDialog>(
+            string.Empty, options);
+        var result = await dialog.Result;
+        if (result.Canceled) return;
+
+        await ProcessDirectPayment(packageId, gatewayProvider: "20card");
+    }
+
+    private async Task ProcessDirectPayment(long packageId, string? gatewayProvider = null)
     {
         if (_isProcessingPayment) return;
 
@@ -439,11 +460,15 @@ public partial class Index
 
         try
         {
-            var response = await PackageContract.CustomerPurchasePackageAsync(new CustomerPurchasePackageRequest
+            var request = new CustomerPurchasePackageRequest
             {
                 PackageId = packageId,
                 PurchaseMethod = PurchaseMethodEnum.PurchaseMethodGateway
-            });
+            };
+            if (!string.IsNullOrWhiteSpace(gatewayProvider))
+                request.GatewayProvider = gatewayProvider;
+
+            var response = await PackageContract.CustomerPurchasePackageAsync(request);
 
             if (!response.Success)
             {

src/FrontOffice.Main/Pages/Profile/PaymentCallback.razor

@@ -85,6 +85,10 @@
     
     [SupplyParameterFromQuery(Name = "Status")]
     private string? Status { get; set; }
+
+    /// <summary>۲۰کارت callback — هم‌معنی Status زرین‌پال</summary>
+    [SupplyParameterFromQuery(Name = "PaymentStatus")]
+    private string? PaymentStatus { get; set; }
     
     private bool _isLoading = true;
     private bool _isSuccess;
@@ -132,6 +136,10 @@
     {
         try
         {
+            // ۲۰کارت: PaymentStatus؛ زرین‌پال: Status
+            if (string.IsNullOrWhiteSpace(Status) && !string.IsNullOrWhiteSpace(PaymentStatus))
+                Status = PaymentStatus;
+
             // تعیین نوع پرداخت — اگر type نباشد، پیش‌فرض خرید پکیج
             var type = PaymentType?.ToLowerInvariant() ?? "package";