feat: 扩展领域模型与配置

src/Domain/TakeoutSaaS.Domain/GroupBuying/Entities/GroupOrder.cs

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+using TakeoutSaaS.Domain.GroupBuying.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.GroupBuying.Entities;
+
+/// <summary>
+/// 拼单活动。
+/// </summary>
+public sealed class GroupOrder : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 门店标识。
+    /// </summary>
+    public Guid StoreId { get; set; }
+
+    /// <summary>
+    /// 关联商品或套餐。
+    /// </summary>
+    public Guid ProductId { get; set; }
+
+    /// <summary>
+    /// 拼单编号。
+    /// </summary>
+    public string GroupOrderNo { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 团长用户 ID。
+    /// </summary>
+    public Guid LeaderUserId { get; set; }
+
+    /// <summary>
+    /// 成团需要的人数。
+    /// </summary>
+    public int TargetCount { get; set; }
+
+    /// <summary>
+    /// 当前已参与人数。
+    /// </summary>
+    public int CurrentCount { get; set; }
+
+    /// <summary>
+    /// 拼团价格。
+    /// </summary>
+    public decimal GroupPrice { get; set; }
+
+    /// <summary>
+    /// 开始时间。
+    /// </summary>
+    public DateTime StartAt { get; set; }
+
+    /// <summary>
+    /// 结束时间。
+    /// </summary>
+    public DateTime EndAt { get; set; }
+
+    /// <summary>
+    /// 拼团状态。
+    /// </summary>
+    public GroupOrderStatus Status { get; set; } = GroupOrderStatus.Open;
+
+    /// <summary>
+    /// 成团时间。
+    /// </summary>
+    public DateTime? SucceededAt { get; set; }
+
+    /// <summary>
+    /// 取消时间。
+    /// </summary>
+    public DateTime? CancelledAt { get; set; }
+}

src/Domain/TakeoutSaaS.Domain/GroupBuying/Entities/GroupParticipant.cs

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+using TakeoutSaaS.Domain.GroupBuying.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.GroupBuying.Entities;
+
+/// <summary>
+/// 拼单参与者。
+/// </summary>
+public sealed class GroupParticipant : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 拼单活动标识。
+    /// </summary>
+    public Guid GroupOrderId { get; set; }
+
+    /// <summary>
+    /// 对应订单标识。
+    /// </summary>
+    public Guid OrderId { get; set; }
+
+    /// <summary>
+    /// 用户标识。
+    /// </summary>
+    public Guid UserId { get; set; }
+
+    /// <summary>
+    /// 参与状态。
+    /// </summary>
+    public GroupParticipantStatus Status { get; set; } = GroupParticipantStatus.Joined;
+
+    /// <summary>
+    /// 参与时间。
+    /// </summary>
+    public DateTime JoinedAt { get; set; } = DateTime.UtcNow;
+}

src/Domain/TakeoutSaaS.Domain/GroupBuying/Enums/GroupOrderStatus.cs

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+namespace TakeoutSaaS.Domain.GroupBuying.Enums;
+
+/// <summary>
+/// 拼单状态。
+/// </summary>
+public enum GroupOrderStatus
+{
+    /// <summary>
+    /// 开放中。
+    /// </summary>
+    Open = 0,
+
+    /// <summary>
+    /// 已成团。
+    /// </summary>
+    Succeeded = 1,
+
+    /// <summary>
+    /// 已取消。
+    /// </summary>
+    Cancelled = 2,
+
+    /// <summary>
+    /// 超时失败。
+    /// </summary>
+    Failed = 3
+}

src/Domain/TakeoutSaaS.Domain/GroupBuying/Enums/GroupParticipantStatus.cs

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+namespace TakeoutSaaS.Domain.GroupBuying.Enums;
+
+/// <summary>
+/// 拼单参与者状态。
+/// </summary>
+public enum GroupParticipantStatus
+{
+    /// <summary>
+    /// 已参团。
+    /// </summary>
+    Joined = 0,
+
+    /// <summary>
+    /// 因退款或取消退出。
+    /// </summary>
+    Exited = 1,
+
+    /// <summary>
+    /// 团失败待退款。
+    /// </summary>
+    PendingRefund = 2
+}