feat: 增加分页排序与FluentValidation

src/Application/TakeoutSaaS.Application/App/Stores/Handlers/SearchStoresQueryHandler.cs

@@ -28,9 +28,27 @@ public sealed class SearchStoresQueryHandler(
             stores = stores.Where(x => x.MerchantId == request.MerchantId.Value).ToList();
         }
 
-        return stores
-            .Select(MapToDto)
+        var sorted = ApplySorting(stores, request.SortBy, request.SortDescending);
+        var paged = sorted
+            .Skip((request.Page - 1) * request.PageSize)
+            .Take(request.PageSize)
             .ToList();
+
+        return paged.Select(MapToDto).ToList();
+    }
+
+    private static IOrderedEnumerable<Domain.Stores.Entities.Store> ApplySorting(
+        IReadOnlyCollection<Domain.Stores.Entities.Store> stores,
+        string? sortBy,
+        bool sortDescending)
+    {
+        return sortBy?.ToLowerInvariant() switch
+        {
+            "name" => sortDescending ? stores.OrderByDescending(x => x.Name) : stores.OrderBy(x => x.Name),
+            "code" => sortDescending ? stores.OrderByDescending(x => x.Code) : stores.OrderBy(x => x.Code),
+            "status" => sortDescending ? stores.OrderByDescending(x => x.Status) : stores.OrderBy(x => x.Status),
+            _ => sortDescending ? stores.OrderByDescending(x => x.CreatedAt) : stores.OrderBy(x => x.CreatedAt)
+        };
     }
 
     private static StoreDto MapToDto(Domain.Stores.Entities.Store store) => new()
@@ -54,6 +72,7 @@ public sealed class SearchStoresQueryHandler(
         DeliveryRadiusKm = store.DeliveryRadiusKm,
         SupportsDineIn = store.SupportsDineIn,
         SupportsPickup = store.SupportsPickup,
-        SupportsDelivery = store.SupportsDelivery
+        SupportsDelivery = store.SupportsDelivery,
+        CreatedAt = store.CreatedAt
     };
 }