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backend/F9WebAiTest.Domain/Entities/SYS/Departments/Department.cs

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+using FreeSql.DataAnnotations;
+using F9WebAiTest.Domain.Enums.SYS.Departments;
+using F9WebAiTest.Domain.Events.SYS.Departments;
+
+namespace F9WebAiTest.Domain.Entities.SYS.Departments;
+
+/// <summary>
+/// 部门：用户与部门是独立聚合，仅保存 DepartmentId 关联（避免双向强耦合）。
+/// 部门用户列表仅用于查询展示，通过读模型实现。
+/// </summary>
+[Table(Name = "sys_departments")]
+public class Department : AggregateRoot
+{
+    [Column(Name = "code")]
+    public string Code { get; private set; }
+
+    [Column(Name = "name")]
+    public string Name { get; private set; }
+
+    [Column(Name = "parent_id")]
+    public long ParentId { get; private set; }
+
+    [Column(Name = "manage_type")]
+    public Department_ManageType_Enum ManageType { get; private set; }
+
+    [Column(Name = "duty_type")]
+    public Department_DutyType_Enum DutyType { get; private set; }
+
+    [Column(Name = "description")]
+    public string? Description { get; private set; }
+
+    [Column(Name = "is_active")]
+    public bool IsActive { get; private set; }
+
+    [Column(Name = "sort_order")]
+    public int SortOrder { get; private set; }
+
+    private readonly List<long> _userIds = [];
+    public IReadOnlyCollection<long> UserIds => _userIds.AsReadOnly();
+
+    public Department() { }
+
+    public Department(long id, string code, string name, long parentId,
+        Department_ManageType_Enum manageType, Department_DutyType_Enum dutyType, int sortOrder, string? description = null)
+    {
+        Id = id;
+        Code = code;
+        Name = name;
+        ParentId = parentId;
+        ManageType = manageType;
+        DutyType = dutyType;
+        SortOrder = sortOrder;
+        Description = description;
+        IsActive = true;
+        AddDomainEvent(new Department_ChangedDomainEvent(Id));
+    }
+
+    public void AddUser(long userId)
+    {
+        if (!_userIds.Contains(userId))
+            _userIds.Add(userId);
+    }
+
+    public void RemoveUser(long userId) => _userIds.Remove(userId);
+
+    public void Activate()
+    {
+        IsActive = true;
+        AddDomainEvent(new Department_ChangedDomainEvent(Id));
+    }
+
+    public void Deactivate()
+    {
+        IsActive = false;
+        AddDomainEvent(new Department_ChangedDomainEvent(Id));
+    }
+
+    public void Deleted() => AddDomainEvent(new Department_ChangedDomainEvent(Id));
+}

backend/F9WebAiTest.Domain/Entities/SYS/Departments/DepartmentUser.cs

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+using FreeSql.DataAnnotations;
+
+namespace F9WebAiTest.Domain.Entities.SYS.Departments;
+
+/// <summary>部门用户关联：部门与用户的关联记录。</summary>
+[Table(Name = "sys_department_users")]
+public class DepartmentUser : BusinessEntity
+{
+    [Column(Name = "department_id")]
+    public long DepartmentId { get; private set; }
+
+    [Column(Name = "user_id")]
+    public long UserId { get; private set; }
+
+    [Column(Name = "assigned_at")]
+    public DateTime AssignedAt { get; private set; }
+
+    public DepartmentUser() { }
+
+    public DepartmentUser(long id, long departmentId, long userId)
+    {
+        Id = id;
+        DepartmentId = departmentId;
+        UserId = userId;
+        AssignedAt = DateTime.UtcNow;
+    }
+}