feat: 列表接口分页排序与验证

src/Application/TakeoutSaaS.Application/App/Products/Handlers/SearchProductsQueryHandler.cs

@@ -2,6 +2,7 @@ using MediatR;
 using TakeoutSaaS.Application.App.Products.Dto;
 using TakeoutSaaS.Application.App.Products.Queries;
 using TakeoutSaaS.Domain.Products.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Results;
 using TakeoutSaaS.Shared.Abstractions.Tenancy;
 
 namespace TakeoutSaaS.Application.App.Products.Handlers;
@@ -12,13 +13,13 @@ namespace TakeoutSaaS.Application.App.Products.Handlers;
 public sealed class SearchProductsQueryHandler(
     IProductRepository productRepository,
     ITenantProvider tenantProvider)
-    : IRequestHandler<SearchProductsQuery, IReadOnlyList<ProductDto>>
+    : IRequestHandler<SearchProductsQuery, PagedResult<ProductDto>>
 {
     private readonly IProductRepository _productRepository = productRepository;
     private readonly ITenantProvider _tenantProvider = tenantProvider;
 
     /// <inheritdoc />
-    public async Task<IReadOnlyList<ProductDto>> Handle(SearchProductsQuery request, CancellationToken cancellationToken)
+    public async Task<PagedResult<ProductDto>> Handle(SearchProductsQuery request, CancellationToken cancellationToken)
     {
         var tenantId = _tenantProvider.GetCurrentTenantId();
         var products = await _productRepository.SearchAsync(tenantId, request.CategoryId, request.Status, cancellationToken);
@@ -34,7 +35,8 @@ public sealed class SearchProductsQueryHandler(
             .Take(request.PageSize)
             .ToList();
 
-        return paged.Select(MapToDto).ToList();
+        var items = paged.Select(MapToDto).ToList();
+        return new PagedResult<ProductDto>(items, request.Page, request.PageSize, products.Count);
     }
 
     private static IOrderedEnumerable<Domain.Products.Entities.Product> ApplySorting(

src/Application/TakeoutSaaS.Application/App/Products/Queries/SearchProductsQuery.cs

@@ -1,13 +1,14 @@
 using MediatR;
 using TakeoutSaaS.Application.App.Products.Dto;
 using TakeoutSaaS.Domain.Products.Enums;
+using TakeoutSaaS.Shared.Abstractions.Results;
 
 namespace TakeoutSaaS.Application.App.Products.Queries;
 
 /// <summary>
 /// 商品列表查询。
 /// </summary>
-public sealed class SearchProductsQuery : IRequest<IReadOnlyList<ProductDto>>
+public sealed class SearchProductsQuery : IRequest<PagedResult<ProductDto>>
 {
     /// <summary>
     /// 门店 ID（可选）。