feat: 扩展领域模型与配置

src/Domain/TakeoutSaaS.Domain/Distribution/Entities/AffiliateOrder.cs

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+using TakeoutSaaS.Domain.Distribution.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Distribution.Entities;
+
+/// <summary>
+/// 分销订单记录。
+/// </summary>
+public sealed class AffiliateOrder : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 推广人标识。
+    /// </summary>
+    public Guid AffiliatePartnerId { get; set; }
+
+    /// <summary>
+    /// 关联订单。
+    /// </summary>
+    public Guid OrderId { get; set; }
+
+    /// <summary>
+    /// 用户 ID。
+    /// </summary>
+    public Guid BuyerUserId { get; set; }
+
+    /// <summary>
+    /// 订单金额。
+    /// </summary>
+    public decimal OrderAmount { get; set; }
+
+    /// <summary>
+    /// 预计佣金。
+    /// </summary>
+    public decimal EstimatedCommission { get; set; }
+
+    /// <summary>
+    /// 当前状态。
+    /// </summary>
+    public AffiliateOrderStatus Status { get; set; } = AffiliateOrderStatus.Pending;
+
+    /// <summary>
+    /// 结算完成时间。
+    /// </summary>
+    public DateTime? SettledAt { get; set; }
+}

src/Domain/TakeoutSaaS.Domain/Distribution/Entities/AffiliatePartner.cs

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+using TakeoutSaaS.Domain.Distribution.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Distribution.Entities;
+
+/// <summary>
+/// 分销/推广合作伙伴。
+/// </summary>
+public sealed class AffiliatePartner : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 用户 ID（如绑定平台账号）。
+    /// </summary>
+    public Guid? UserId { get; set; }
+
+    /// <summary>
+    /// 昵称或渠道名称。
+    /// </summary>
+    public string DisplayName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 联系电话。
+    /// </summary>
+    public string? Phone { get; set; }
+
+    /// <summary>
+    /// 渠道类型。
+    /// </summary>
+    public AffiliateChannelType ChannelType { get; set; } = AffiliateChannelType.Personal;
+
+    /// <summary>
+    /// 分成比例（0-1）。
+    /// </summary>
+    public decimal CommissionRate { get; set; }
+
+    /// <summary>
+    /// 当前状态。
+    /// </summary>
+    public AffiliateStatus Status { get; set; } = AffiliateStatus.Pending;
+
+    /// <summary>
+    /// 审核备注。
+    /// </summary>
+    public string? Remarks { get; set; }
+}

src/Domain/TakeoutSaaS.Domain/Distribution/Entities/AffiliatePayout.cs

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+using TakeoutSaaS.Domain.Distribution.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Distribution.Entities;
+
+/// <summary>
+/// 佣金结算记录。
+/// </summary>
+public sealed class AffiliatePayout : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 合作伙伴标识。
+    /// </summary>
+    public Guid AffiliatePartnerId { get; set; }
+
+    /// <summary>
+    /// 结算周期描述。
+    /// </summary>
+    public string Period { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 结算金额。
+    /// </summary>
+    public decimal Amount { get; set; }
+
+    /// <summary>
+    /// 状态。
+    /// </summary>
+    public PayoutStatus Status { get; set; } = PayoutStatus.Pending;
+
+    /// <summary>
+    /// 打款时间。
+    /// </summary>
+    public DateTime? PaidAt { get; set; }
+
+    /// <summary>
+    /// 备注。
+    /// </summary>
+    public string? Remarks { get; set; }
+}