feat: integrate PYMS payment gateway, add blog/sitepage/image services, local file manager

Payment Gateway:
- Add PYMSPaymentService: IPaymentGatewayService via gRPC to PYMS microservice
- Add ZarinPalPaymentService: direct ZarinPal integration (backup)
- Register 'pyms' payment provider in DI ConfigureServices
- Add PYMS proto files (pyms_transaction.proto, pyms_public_messages.proto)
- Fix VerifyDiscountWalletCharge: pass 'OK' as status instead of Authority
- Update appsettings: PaymentProvider=pyms, sandbox mode, merchant ID

Blog System:
- Add BlogCategory, BlogPost, BlogPostImage entities and CQRS
- Add proto files and gRPC services for blog management
- Add Mapster profiles for blog responses

Content Management:
- Add SitePage entity and CQRS for static pages
- Add proto and gRPC service for site pages

Image/File Management:
- Add LocalFileManager with disk storage + base64 serving + FMS fallback
- Add ImagePathResolverInterceptor for gRPC responses
- Add ImageResolverService for explicit image resolution
- Add UploadsController for public file serving with FMS fallback
- Add PaymentCallbackController for discount order payment callbacks

Database:
- Add blog and content entity migrations
- Remove ImagePath MaxLength constraints
- Remove old FileManagementService (replaced by LocalFileManager)

src/CMSMicroservice.WebApi/Services/UserOrderService.cs

@@ -167,14 +167,14 @@ public class UserOrderService : UserOrderContract.UserOrderContractBase
         {
             UserId = request.Filter?.UserId ?? 0, // 0 means all users (admin view)
             PaginationState = request.PaginationState?.Adapt<AppModels.PaginationState>(),
-            PaymentStatusFilter = request.Filter?.PaymentStatus != null
+            PaymentStatusFilter = request.Filter?.HasPaymentStatus == true
                 ? (int?)request.Filter.PaymentStatus
                 : null,
-            DeliveryStatusFilter = request.Filter?.DeliveryStatus != null
+            DeliveryStatusFilter = request.Filter?.HasDeliveryStatus == true
                 ? (int?)request.Filter.DeliveryStatus
                 : null,
-            FromDate = request.Filter?.PaymentDate?.ToDateTime(),
-            ToDate = null
+            FromDate = request.Filter?.FromDate?.ToDateTime() ?? request.Filter?.PaymentDate?.ToDateTime(),
+            ToDate = request.Filter?.ToDate?.ToDateTime()
         };
 
         var result = await _sender.Send(query, context.CancellationToken);
@@ -261,7 +261,14 @@ public class UserOrderService : UserOrderContract.UserOrderContractBase
             
         if (defaultAddress == null)
         {
-            throw new RpcException(new Status(StatusCode.FailedPrecondition, "آدرس پیش‌فرض یافت نشد"));
+            // Check if user has any address at all
+            var hasAnyAddress = await _context.UserAddresses
+                .AnyAsync(a => a.UserId == userId && !a.IsDeleted, context.CancellationToken);
+                
+            throw new RpcException(new Status(StatusCode.FailedPrecondition, 
+                hasAnyAddress 
+                    ? "لطفاً یک آدرس را به عنوان پیش‌فرض انتخاب کنید." 
+                    : "آدرسی ثبت نشده است. لطفاً ابتدا یک آدرس اضافه کنید."));
         }
         
         // Calculate amounts
@@ -591,14 +598,14 @@ public class UserOrderService : UserOrderContract.UserOrderContractBase
         {
             UserId = customerUserId,
             PaginationState = request.PaginationState?.Adapt<AppModels.PaginationState>(),
-            PaymentStatusFilter = request.Filter?.PaymentStatus != null
+            PaymentStatusFilter = request.Filter?.HasPaymentStatus == true
                 ? (int?)request.Filter.PaymentStatus
                 : null,
-            DeliveryStatusFilter = request.Filter?.DeliveryStatus != null
+            DeliveryStatusFilter = request.Filter?.HasDeliveryStatus == true
                 ? (int?)request.Filter.DeliveryStatus
                 : null,
-            FromDate = request.Filter?.PaymentDate?.ToDateTime(),
-            ToDate = null
+            FromDate = request.Filter?.FromDate?.ToDateTime() ?? request.Filter?.PaymentDate?.ToDateTime(),
+            ToDate = request.Filter?.ToDate?.ToDateTime()
         };
 
         var result = await _sender.Send(query, context.CancellationToken);