feat: 扩展领域模型与配置

src/Domain/TakeoutSaaS.Domain/Engagement/Entities/CheckInCampaign.cs

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+using TakeoutSaaS.Domain.Engagement.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Engagement.Entities;
+
+/// <summary>
+/// 签到活动配置。
+/// </summary>
+public sealed class CheckInCampaign : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 活动名称。
+    /// </summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 活动描述。
+    /// </summary>
+    public string? Description { get; set; }
+
+    /// <summary>
+    /// 开始日期。
+    /// </summary>
+    public DateTime StartDate { get; set; }
+
+    /// <summary>
+    /// 结束日期。
+    /// </summary>
+    public DateTime EndDate { get; set; }
+
+    /// <summary>
+    /// 支持补签次数。
+    /// </summary>
+    public int AllowMakeupCount { get; set; }
+
+    /// <summary>
+    /// 连签奖励 JSON。
+    /// </summary>
+    public string RewardsJson { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 状态。
+    /// </summary>
+    public CheckInCampaignStatus Status { get; set; } = CheckInCampaignStatus.Draft;
+}

src/Domain/TakeoutSaaS.Domain/Engagement/Entities/CheckInRecord.cs

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+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Engagement.Entities;
+
+/// <summary>
+/// 用户签到记录。
+/// </summary>
+public sealed class CheckInRecord : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 活动标识。
+    /// </summary>
+    public Guid CheckInCampaignId { get; set; }
+
+    /// <summary>
+    /// 用户标识。
+    /// </summary>
+    public Guid UserId { get; set; }
+
+    /// <summary>
+    /// 签到日期（本地）。
+    /// </summary>
+    public DateTime CheckInDate { get; set; }
+
+    /// <summary>
+    /// 是否补签。
+    /// </summary>
+    public bool IsMakeup { get; set; }
+
+    /// <summary>
+    /// 获得奖励 JSON。
+    /// </summary>
+    public string RewardJson { get; set; } = string.Empty;
+}

src/Domain/TakeoutSaaS.Domain/Engagement/Entities/CommunityComment.cs

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+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Engagement.Entities;
+
+/// <summary>
+/// 社区评论。
+/// </summary>
+public sealed class CommunityComment : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 动态标识。
+    /// </summary>
+    public Guid PostId { get; set; }
+
+    /// <summary>
+    /// 评论人。
+    /// </summary>
+    public Guid AuthorUserId { get; set; }
+
+    /// <summary>
+    /// 评论内容。
+    /// </summary>
+    public string Content { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 父级评论 ID。
+    /// </summary>
+    public Guid? ParentId { get; set; }
+
+    /// <summary>
+    /// 状态。
+    /// </summary>
+    public bool IsDeleted { get; set; }
+}

src/Domain/TakeoutSaaS.Domain/Engagement/Entities/CommunityPost.cs

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+using TakeoutSaaS.Domain.Engagement.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Engagement.Entities;
+
+/// <summary>
+/// 社区动态。
+/// </summary>
+public sealed class CommunityPost : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 作者用户 ID。
+    /// </summary>
+    public Guid AuthorUserId { get; set; }
+
+    /// <summary>
+    /// 标题。
+    /// </summary>
+    public string? Title { get; set; }
+
+    /// <summary>
+    /// 内容。
+    /// </summary>
+    public string Content { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 媒体资源 JSON。
+    /// </summary>
+    public string? MediaJson { get; set; }
+
+    /// <summary>
+    /// 状态。
+    /// </summary>
+    public PostStatus Status { get; set; } = PostStatus.PendingReview;
+
+    /// <summary>
+    /// 点赞数。
+    /// </summary>
+    public int LikeCount { get; set; }
+
+    /// <summary>
+    /// 评论数。
+    /// </summary>
+    public int CommentCount { get; set; }
+}

src/Domain/TakeoutSaaS.Domain/Engagement/Entities/CommunityReaction.cs

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+using TakeoutSaaS.Domain.Engagement.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Engagement.Entities;
+
+/// <summary>
+/// 社区互动反馈。
+/// </summary>
+public sealed class CommunityReaction : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 动态 ID。
+    /// </summary>
+    public Guid PostId { get; set; }
+
+    /// <summary>
+    /// 用户 ID。
+    /// </summary>
+    public Guid UserId { get; set; }
+
+    /// <summary>
+    /// 反应类型。
+    /// </summary>
+    public ReactionType ReactionType { get; set; } = ReactionType.Like;
+
+    /// <summary>
+    /// 时间戳。
+    /// </summary>
+    public DateTime ReactedAt { get; set; } = DateTime.UtcNow;
+}

src/Domain/TakeoutSaaS.Domain/Engagement/Enums/CheckInCampaignStatus.cs

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+namespace TakeoutSaaS.Domain.Engagement.Enums;
+
+/// <summary>
+/// 签到活动状态。
+/// </summary>
+public enum CheckInCampaignStatus
+{
+    /// <summary>
+    /// 草稿。
+    /// </summary>
+    Draft = 0,
+
+    /// <summary>
+    /// 进行中。
+    /// </summary>
+    Active = 1,
+
+    /// <summary>
+    /// 已结束。
+    /// </summary>
+    Completed = 2,
+
+    /// <summary>
+    /// 已停用。
+    /// </summary>
+    Disabled = 3
+}

src/Domain/TakeoutSaaS.Domain/Engagement/Enums/PostStatus.cs

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+namespace TakeoutSaaS.Domain.Engagement.Enums;
+
+/// <summary>
+/// 社区动态状态。
+/// </summary>
+public enum PostStatus
+{
+    /// <summary>
+    /// 待审核。
+    /// </summary>
+    PendingReview = 0,
+
+    /// <summary>
+    /// 已发布。
+    /// </summary>
+    Published = 1,
+
+    /// <summary>
+    /// 已屏蔽。
+    /// </summary>
+    Blocked = 2,
+
+    /// <summary>
+    /// 已删除。
+    /// </summary>
+    Deleted = 3
+}

src/Domain/TakeoutSaaS.Domain/Engagement/Enums/ReactionType.cs

@@ -0,0 +1,22 @@
+namespace TakeoutSaaS.Domain.Engagement.Enums;
+
+/// <summary>
+/// 互动类型。
+/// </summary>
+public enum ReactionType
+{
+    /// <summary>
+    /// 点赞。
+    /// </summary>
+    Like = 0,
+
+    /// <summary>
+    /// 收藏。
+    /// </summary>
+    Favorite = 1,
+
+    /// <summary>
+    /// 点踩。
+    /// </summary>
+    Dislike = 2
+}