Добавьте файлы проекта.

demoBicycle/Models/OrderType.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+
+namespace demoBicycle.Models;
+
+public partial class OrderType
+{
+    public int Id { get; set; }
+
+    public string OrderTypeName { get; set; } = null!;
+
+    public virtual ICollection<Order> Orders { get; set; } = new List<Order>();
+}