1.更换软件协议为AGPL

2.切换项目名称为Hua.Todo

src/Hua.Todo.Core/Entities/TaskEntity.cs

@@ -0,0 +1,52 @@
+namespace Hua.Todo.Core.Entities;
+
+/// <summary>
+/// 任务实体类，表示一个代办
+/// </summary>
+public class TaskEntity
+{
+    /// <summary>
+    /// 任务唯一标识符
+    /// </summary>
+    public int Id { get; set; }
+    
+    /// <summary>
+    /// 任务标题
+    /// </summary>
+    public string Title { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// 任务优先级
+    /// </summary>
+    public TaskPriority Priority { get; set; } = TaskPriority.Medium;
+    
+    /// <summary>
+    /// 任务是否已完成
+    /// </summary>
+    public bool IsCompleted { get; set; }
+    
+    /// <summary>
+    /// 任务创建时间（UTC）
+    /// </summary>
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    
+    /// <summary>
+    /// 任务最后更新时间（UTC）
+    /// </summary>
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+    
+    /// <summary>
+    /// 父任务ID，用于支持子任务功能
+    /// </summary>
+    public int? ParentTaskId { get; set; }
+    
+    /// <summary>
+    /// 父任务导航属性
+    /// </summary>
+    public TaskEntity? ParentTask { get; set; }
+    
+    /// <summary>
+    /// 子任务集合
+    /// </summary>
+    public List<TaskEntity> SubTasks { get; set; } = new();
+}