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();
+}

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

@@ -0,0 +1,22 @@
+namespace Hua.Todo.Core.Entities;
+
+/// <summary>
+/// 任务优先级枚举，定义任务的三种优先级级别
+/// </summary>
+public enum TaskPriority
+{
+    /// <summary>
+    /// 低优先级
+    /// </summary>
+    Low = 0,
+    
+    /// <summary>
+    /// 中优先级（默认）
+    /// </summary>
+    Medium = 1,
+    
+    /// <summary>
+    /// 高优先级
+    /// </summary>
+    High = 2
+}

src/Hua.Todo.Core/Hua.Todo.Core.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+    <GenerateTargetFrameworkAttribute>false</GenerateTargetFrameworkAttribute>
+  </PropertyGroup>
+
+</Project>

src/Hua.Todo.Core/Interfaces/ITaskRepository.cs

@@ -0,0 +1,61 @@
+using Hua.Todo.Core.Entities;
+
+namespace Hua.Todo.Core.Interfaces;
+
+/// <summary>
+/// 任务仓储接口，定义任务数据访问操作
+/// </summary>
+public interface ITaskRepository
+{
+    /// <summary>
+    /// 获取所有任务
+    /// </summary>
+    /// <returns>任务列表</returns>
+    System.Threading.Tasks.Task<List<TaskEntity>> GetAllAsync();
+    
+    /// <summary>
+    /// 根据ID获取指定任务
+    /// </summary>
+    /// <param name="id">任务ID</param>
+    /// <returns>任务对象，如果不存在则返回null</returns>
+    System.Threading.Tasks.Task<TaskEntity?> GetByIdAsync(int id);
+    
+    /// <summary>
+    /// 获取所有未完成的任务
+    /// </summary>
+    /// <returns>未完成任务列表</returns>
+    System.Threading.Tasks.Task<List<TaskEntity>> GetActiveTasksAsync();
+    
+    /// <summary>
+    /// 获取所有已完成的任务
+    /// </summary>
+    /// <returns>已完成任务列表</returns>
+    System.Threading.Tasks.Task<List<TaskEntity>> GetCompletedTasksAsync();
+    
+    /// <summary>
+    /// 添加新任务
+    /// </summary>
+    /// <param name="taskEntity">要添加的任务对象</param>
+    /// <returns>添加后的任务对象（包含生成的ID）</returns>
+    System.Threading.Tasks.Task<TaskEntity> AddAsync(TaskEntity taskEntity);
+    
+    /// <summary>
+    /// 更新任务
+    /// </summary>
+    /// <param name="taskEntity">要更新的任务对象</param>
+    /// <returns>更新后的任务对象</returns>
+    System.Threading.Tasks.Task<TaskEntity> UpdateAsync(TaskEntity taskEntity);
+    
+    /// <summary>
+    /// 删除指定ID的任务
+    /// </summary>
+    /// <param name="id">任务ID</param>
+    System.Threading.Tasks.Task DeleteAsync(int id);
+    
+    /// <summary>
+    /// 获取指定父任务的所有子任务
+    /// </summary>
+    /// <param name="parentTaskId">父任务ID</param>
+    /// <returns>子任务列表</returns>
+    System.Threading.Tasks.Task<List<TaskEntity>> GetSubTasksAsync(int parentTaskId);
+}