feat: Implement DiscountCategoryProfile for mapping GetDiscountCategories response to protobuf

src/BackOffice.BFF.WebApi/Common/Mappings/DiscountCategoryProfile.cs

@@ -0,0 +1,43 @@
+using BackOffice.BFF.Application.DiscountCategoryCQ.Queries.GetDiscountCategories;
+using BackOffice.BFF.DiscountCategory.Protobuf.Protos.DiscountCategory;
+using Google.Protobuf.WellKnownTypes;
+using Mapster;
+
+namespace BackOffice.BFF.WebApi.Common.Mappings;
+
+public class DiscountCategoryProfile : IRegister
+{
+    void IRegister.Register(TypeAdapterConfig config)
+    {
+        // Map GetDiscountCategories response DTO to protobuf response
+        config.NewConfig<GetDiscountCategoriesResponseDto, GetDiscountCategoriesResponse>()
+            .MapWith(src => new GetDiscountCategoriesResponse
+            {
+                Categories = { src.Categories.Select(MapCategoryTree) }
+            });
+    }
+
+    private static DiscountCategoryDto MapCategoryTree(DiscountCategoryTreeDto src)
+    {
+        var dto = new DiscountCategoryDto
+        {
+            Id = src.Id,
+            Name = src.Name ?? string.Empty,
+            Title = src.Title ?? string.Empty,
+            Description = !string.IsNullOrWhiteSpace(src.Description) ? src.Description : null,
+            ImagePath = !string.IsNullOrWhiteSpace(src.ImagePath) ? src.ImagePath : null,
+            ParentCategoryId = src.ParentCategoryId,
+            SortOrder = src.SortOrder,
+            IsActive = src.IsActive,
+            ProductCount = src.ProductCount
+        };
+
+        // Recursively map children
+        if (src.ChildCategories != null && src.ChildCategories.Any())
+        {
+            dto.Children.AddRange(src.ChildCategories.Select(MapCategoryTree));
+        }
+
+        return dto;
+    }
+}