feat: 扩展领域模型与配置

src/Domain/TakeoutSaaS.Domain/Orders/Entities/OrderItem.cs

@@ -0,0 +1,59 @@
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Orders.Entities;
+
+/// <summary>
+/// 订单明细。
+/// </summary>
+public sealed class OrderItem : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 订单 ID。
+    /// </summary>
+    public Guid OrderId { get; set; }
+
+    /// <summary>
+    /// 商品 ID。
+    /// </summary>
+    public Guid ProductId { get; set; }
+
+    /// <summary>
+    /// 商品名称。
+    /// </summary>
+    public string ProductName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// SKU/规格描述。
+    /// </summary>
+    public string? SkuName { get; set; }
+
+    /// <summary>
+    /// 单位。
+    /// </summary>
+    public string? Unit { get; set; }
+
+    /// <summary>
+    /// 数量。
+    /// </summary>
+    public int Quantity { get; set; }
+
+    /// <summary>
+    /// 单价。
+    /// </summary>
+    public decimal UnitPrice { get; set; }
+
+    /// <summary>
+    /// 折扣金额。
+    /// </summary>
+    public decimal DiscountAmount { get; set; }
+
+    /// <summary>
+    /// 小计。
+    /// </summary>
+    public decimal SubTotal { get; set; }
+
+    /// <summary>
+    /// 自定义属性 JSON。
+    /// </summary>
+    public string? AttributesJson { get; set; }
+}