refactor: remove PYMS microservice, use ZarinPal directly in CMS

- Remove PYMSPaymentService.cs and PYMS proto files
- Remove 'pyms' case from DI ConfigureServices
- Remove PYMS config from appsettings
- Switch PaymentProvider to 'zarinpal' (direct integration)
- ZarinPalPaymentService handles sandbox/production, verify, errors
- PYMS deployment/service/ingress removed from K8s

src/CMSMicroservice.Infrastructure/ConfigureServices.cs

@@ -75,7 +75,7 @@ public static class ConfigureServices
         }
         
         // Payment Gateway Service - Multi-Provider Architecture
-        // پشتیبانی از درگاه‌های مختلف: ZarinPal, Daya, PYMS, Mock
+        // پشتیبانی از درگاه‌های مختلف: ZarinPal, Daya, Mock
         var paymentProvider = configuration.GetValue<string>("PaymentProvider", "Mock")?.ToLowerInvariant();
         
         switch (paymentProvider)
@@ -90,11 +90,6 @@ public static class ConfigureServices
                     .SetHandlerLifetime(TimeSpan.FromMinutes(5));
                 break;
             
-            case "pyms":
-                // PYMS (Payment Microservice) — ارتباط gRPC با سرویس پرداخت مستقل
-                services.AddSingleton<IPaymentGatewayService, PYMSPaymentService>();
-                break;
-            
             case "mock":
             default:
                 services.AddScoped<IPaymentGatewayService, MockPaymentGatewayService>();