feat: update product service to support in-stock filtering and enhance top-selling product retrieval

- Modified `GetTopSellingAsync` methods in `ProductService` and `DiscountProductService` to include an optional `inStock` parameter for filtering products based on availability.
- Introduced a constant for the top product count in `Index.razor.cs` to improve maintainability and readability.
- Updated the product retrieval logic in `Index.razor.cs` to utilize the new in-stock filtering feature.

These changes enhance the product listing functionality by allowing users to view only in-stock top-selling products, improving the overall shopping experience.

src/FrontOffice.Main/FrontOffice.Main.csproj

@@ -11,7 +11,7 @@
   <ItemGroup>
     <PackageReference Include="DateTimeConverterCL" Version="1.0.0" />
     <!-- Replace all FrontOffice.BFF protobuf packages with CMS protobuf -->
-    <PackageReference Include="Foursat.CMSMicroservice.Protobuf" Version="0.0.202" />
+    <PackageReference Include="Foursat.CMSMicroservice.Protobuf" Version="0.0.204" />
 <!--    <ProjectReference Include="../../../CMS/src/CMSMicroservice.Protobuf/CMSMicroservice.Protobuf.csproj" />-->
     <PackageReference Include="MudBlazor" Version="8.14.0" />
     <PackageReference Include="Blazored.LocalStorage" Version="4.5.0" />

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

@@ -24,6 +24,8 @@ public partial class Index : IDisposable
     private LandingSettings? _settings;
 
     // ── Top-selling product sections ──
+    private const int LandingTopProductCount = 6;
+
     private List<Product> _topRegularProducts = new();
     private List<DiscountProductCard> _topDiscountProducts = new();
     private bool _loadingTopProducts = true;
@@ -65,9 +67,9 @@ public partial class Index : IDisposable
         PopulateFromSettings();
         _dataLoaded = true;
 
-        // Load top-selling products and blog posts in parallel
-        var topRegTask = ProductService.GetTopSellingAsync(6);
-        var topDiscTask = DiscountProductService.GetTopSellingAsync(6);
+        // Load top-selling in-stock products and blog posts in parallel
+        var topRegTask = ProductService.GetTopSellingAsync(LandingTopProductCount, inStock: true);
+        var topDiscTask = DiscountProductService.GetTopSellingAsync(LandingTopProductCount, inStock: true);
         var featuredPostsTask = BlogPostService.GetFeaturedPostsAsync(2);
 
         try

src/FrontOffice.Main/Utilities/DiscountProductService.cs

@@ -127,8 +127,8 @@ public class DiscountProductService
         }
     }
 
-    public Task<DiscountProductListResult> GetTopSellingAsync(int count = 6)
-        => GetProductsAsync(page: 1, pageSize: count, sortBy: "SaleCount desc");
+    public Task<DiscountProductListResult> GetTopSellingAsync(int count = 6, bool? inStock = null)
+        => GetProductsAsync(page: 1, pageSize: count, sortBy: "SaleCount desc", inStock: inStock);
 
     public async Task<DiscountProductDetail?> GetByIdAsync(long productId)
     {

src/FrontOffice.Main/Utilities/ProductService.cs

@@ -71,12 +71,12 @@ public class ProductService
         return result.Products;
     }
 
-    public Task<ProductListResult> GetTopSellingAsync(int count = 6)
-        => GetProductsPagedAsync(sortBy: "SaleCount desc", page: 1, pageSize: count);
+    public Task<ProductListResult> GetTopSellingAsync(int count = 6, bool? inStock = null)
+        => GetProductsPagedAsync(sortBy: "SaleCount desc", page: 1, pageSize: count, inStock: inStock);
 
     public async Task<ProductListResult> GetProductsPagedAsync(
         string? query = null, long? categoryId = null, string? sortBy = null,
-        int page = 1, int pageSize = 12)
+        int page = 1, int pageSize = 12, bool? inStock = null)
     {
         try
         {
@@ -87,20 +87,25 @@ public class ProductService
                     PageNumber = page,
                     PageSize = pageSize
                 },
-                Filter = new GetAllProductsByFilterFilter
-                {
-                    Title = query ?? string.Empty,
-                    Description = query ?? string.Empty,
-                    ShortInfomation = query ?? string.Empty,
-                    FullInformation = query ?? string.Empty
-                }
+                Filter = new GetAllProductsByFilterFilter()
             };
 
+            // فقط Title — CMS فیلترها را AND می‌زند؛ ارسال query در همه فیلدها جستجو را می‌شکند
+            if (!string.IsNullOrWhiteSpace(query))
+            {
+                request.Filter.Title = query.Trim();
+            }
+
             if (categoryId is { } value)
             {
                 request.Filter.CategoryId = value;
             }
 
+            if (inStock.HasValue)
+            {
+                request.Filter.InStock = inStock.Value;
+            }
+
             if (!string.IsNullOrEmpty(sortBy))
             {
                 request.SortBy = sortBy;