Добавил интерфейсы логики

InternetShop/InternetShopContracts/LogicsContracts/IOrderLogic.cs

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+using InternetShopContracts.DataBindingModels;
+using InternetShopContracts.DataSearchModels;
+using InternetShopContracts.DataViewModels;
+
+namespace InternetShopContracts.LogicsContracts
+{
+    public interface IOrderLogic
+    {
+        List<OrderViewModel> ReadList(OrderSearchModel? model = null);
+        OrderViewModel? ReadElement(OrderSearchModel model);
+        bool Create(OrderBindingModel model);
+        bool Update(OrderBindingModel model);
+        bool Delete(OrderBindingModel model);
+    }
+}

InternetShop/InternetShopContracts/LogicsContracts/IProductLogic.cs

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+using InternetShopContracts.DataBindingModels;
+using InternetShopContracts.DataSearchModels;
+using InternetShopContracts.DataViewModels;
+
+namespace InternetShopContracts.LogicsContracts
+{
+    public interface IProductLogic
+    {
+        List<ProductViewModel> ReadList(ProductSearchModel? model = null);
+        ProductViewModel? ReadElement(ProductSearchModel model);
+        bool Create(ProductBindingModel model);
+        bool Update(ProductBindingModel model);
+        bool Delete(ProductBindingModel model);
+    }
+}