feat: extend discount product gRPC API with sort_by and sale_count

- Add sort_by (StringValue) to GetDiscountProductsRequest proto to enable dynamic sorting
- Add sale_count (int32) to DiscountProductDto proto for top-seller exposure
- Update GetDiscountProductsQuery with SortBy property
- Update GetDiscountProductsQueryHandler to use ApplyOrder(SortBy) with fallback to Created desc; project SaleCount in SELECT
- Add SortBy and SaleCount Mapster mappings in DiscountProductProfile
- Bump CMSMicroservice.Protobuf version to 0.0.196

Co-authored-by: Cursor <cursoragent@cursor.com>

src/CMSMicroservice.Application/DiscountShopCQ/Queries/GetDiscountProducts/GetDiscountProductsQuery.cs

@@ -11,6 +11,7 @@ public class GetDiscountProductsQuery : IRequest<GetDiscountProductsResponseDto>
     public bool? IsActive { get; set; }
     public int? MinPrice { get; set; }
     public int? MaxPrice { get; set; }
+    public string? SortBy { get; set; }
 }
 
 public class GetDiscountProductsResponseDto

src/CMSMicroservice.Application/DiscountShopCQ/Queries/GetDiscountProducts/GetDiscountProductsQueryHandler.cs

@@ -1,3 +1,4 @@
+using CMSMicroservice.Application.Common.Extensions;
 using CMSMicroservice.Application.Common.Interfaces;
 using CMSMicroservice.Application.Common.Models;
 using MediatR;
@@ -51,13 +52,16 @@ public class GetDiscountProductsQueryHandler : IRequestHandler<GetDiscountProduc
             query = query.Where(p => p.Price <= request.MaxPrice.Value);
         }
 
+        if (!string.IsNullOrEmpty(request.SortBy))
+            query = query.ApplyOrder(request.SortBy);
+        else
+            query = query.OrderByDescending(p => p.Created);
+
         var totalCount = await query.CountAsync(cancellationToken);
 
-        // Apply pagination
         var pagination = request.PaginationQuery ?? new PaginationState { PageNumber = 1, PageSize = 10 };
-        
+
         var products = await query
-            .OrderByDescending(p => p.Created)
             .Skip((pagination.PageNumber - 1) * pagination.PageSize)
             .Take(pagination.PageSize)
             .Select(p => new DiscountProductDto

src/CMSMicroservice.Protobuf/CMSMicroservice.Protobuf.csproj

@@ -3,7 +3,7 @@
     <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
-    <Version>0.0.195</Version>
+    <Version>0.0.196</Version>
     <DebugType>None</DebugType>
     <DebugSymbols>False</DebugSymbols>
     <GeneratePackageOnBuild>False</GeneratePackageOnBuild>

src/CMSMicroservice.Protobuf/Protos/discountproduct.proto

@@ -163,6 +163,7 @@ message GetDiscountProductsRequest
     google.protobuf.BoolValue in_stock = 6;
     int32 page_number = 7;
     int32 page_size = 8;
+    google.protobuf.StringValue sort_by = 9;
 }
 
 message GetDiscountProductsResponse
@@ -184,6 +185,7 @@ message DiscountProductDto
     int32 view_count = 9;
     bool is_active = 10;
     google.protobuf.Timestamp created = 11;
+    int32 sale_count = 12;
 }
 
 // ===== Product Image Gallery Messages =====

src/CMSMicroservice.WebApi/Common/Mappings/DiscountProductProfile.cs

@@ -23,6 +23,8 @@ public class DiscountProductProfile : IRegister
                 src => src.MinPrice != null ? (int?)src.MinPrice.Value : null)
             .Map(dest => dest.MaxPrice,
                 src => src.MaxPrice != null ? (int?)src.MaxPrice.Value : null)
+            .Map(dest => dest.SortBy,
+                src => string.IsNullOrEmpty(src.SortBy) ? null : src.SortBy)
             .Map(dest => dest.PaginationQuery, src => new PaginationState
             {
                 PageNumber = src.PageNumber > 0 ? src.PageNumber : 1,
@@ -64,6 +66,7 @@ public class DiscountProductProfile : IRegister
                     ThumbnailPath = p.ThumbnailPath ?? string.Empty,
                     RemainingCount = p.RemainingCount,
                     ViewCount = p.ViewCount,
+                    SaleCount = p.SaleCount,
                     IsActive = p.IsActive,
                     Created = Timestamp.FromDateTime(DateTime.UtcNow)
                 });