重构作业结构：优化实体模型、DTO映射和前端界面

- 重构AppMainStruct、AssignmentQuestion、Question等实体模型
- 更新相关DTO以匹配新的数据结构
- 优化前端页面布局和组件
- 添加全局信息和笔记功能相关代码
- 更新数据库迁移和程序配置

TechHelper.Client/Services/NoteService.cs

@@ -0,0 +1,151 @@
+using Entities.DTO;
+using System.Net.Http.Json;
+using TechHelper.Client.AI;
+using TechHelper.Services;
+
+namespace TechHelper.Client.Services
+{
+	public class NoteService : INoteService
+	{
+		private readonly HttpClient _client;
+
+		public NoteService(HttpClient client)
+		{
+			_client = client;
+		}
+
+		/// <summary>
+		/// 添加一个新笔记
+		/// </summary>
+		/// <param name="dto">包含笔记数据的数据传输对象</param>
+		/// <returns>操作结果</returns>
+		public async Task<ApiResponse> AddNote(GlobalDto dto)
+		{
+			try
+			{
+				var response = await _client.PostAsJsonAsync("note", dto);
+
+				if (response.IsSuccessStatusCode)
+				{
+					var result = await response.Content.ReadFromJsonAsync<ApiResponse>();
+					return result ?? ApiResponse.Success("操作成功。");
+				}
+				else
+				{
+					var errorContent = await response.Content.ReadAsStringAsync();
+					return ApiResponse.Error($"添加失败。状态码: {response.StatusCode}。详情: {errorContent}");
+				}
+			}
+			catch (HttpRequestException ex)
+			{
+				return ApiResponse.Error($"网络请求错误: {ex.Message}");
+			}
+		}
+
+		/// <summary>
+		/// 根据 ID 删除一个笔记
+		/// </summary>
+		/// <param name="id">要删除的笔记的 ID</param>
+		/// <returns>操作结果</returns>
+		public async Task<ApiResponse> DeleteNote(byte id)
+		{
+			try
+			{
+				var response = await _client.DeleteAsync($"note/{id}");
+
+				if (response.IsSuccessStatusCode)
+				{
+					var result = await response.Content.ReadFromJsonAsync<ApiResponse>();
+					return result ?? ApiResponse.Success("删除成功。");
+				}
+				else
+				{
+					var errorContent = await response.Content.ReadAsStringAsync();
+					return ApiResponse.Error($"删除失败。状态码: {response.StatusCode}。详情: {errorContent}");
+				}
+			}
+			catch (HttpRequestException ex)
+			{
+				return ApiResponse.Error($"网络请求错误: {ex.Message}");
+			}
+		}
+
+		/// <summary>
+		/// 获取所有笔记
+		/// </summary>
+		/// <returns>包含所有笔记列表的操作结果</returns>
+		public async Task<ApiResponse> GetAllNotes()
+		{
+			try
+			{
+				var response = await _client.GetAsync("note");
+
+				if (response.IsSuccessStatusCode)
+				{
+					var result = await response.Content.ReadFromJsonAsync<ApiResponse>();
+					return result ?? ApiResponse.Success("获取成功。");
+				}
+				else
+				{
+					var errorContent = await response.Content.ReadAsStringAsync();
+					return ApiResponse.Error($"获取失败。状态码: {response.StatusCode}。详情: {errorContent}");
+				}
+			}
+			catch (HttpRequestException ex)
+			{
+				return ApiResponse.Error($"网络请求错误: {ex.Message}");
+			}
+		}
+
+		/// <summary>
+		/// 根据 ID 获取单个笔记
+		/// </summary>
+		/// <param name="id">要获取的笔记的 ID</param>
+		/// <returns>包含单个笔记数据的操作结果</returns>
+		public async Task<ApiResponse> GetNote(byte id)
+		{
+			try
+			{
+				var response = await _client.GetAsync($"note/{id}");
+
+				if (response.IsSuccessStatusCode)
+				{
+					var result = await response.Content.ReadFromJsonAsync<ApiResponse>();
+					return result ?? ApiResponse.Success("获取成功。");
+				}
+				else
+				{
+					var errorContent = await response.Content.ReadAsStringAsync();
+					return ApiResponse.Error($"获取失败。状态码: {response.StatusCode}。详情: {errorContent}");
+				}
+			}
+			catch (HttpRequestException ex)
+			{
+				return ApiResponse.Error($"网络请求错误: {ex.Message}");
+			}
+		}
+
+		public async Task<ApiResponse> UpdateNote(GlobalDto dto)
+		{
+			try
+			{
+				var response = await _client.PutAsJsonAsync("note", dto);
+
+				if (response.IsSuccessStatusCode)
+				{
+					var result = await response.Content.ReadFromJsonAsync<ApiResponse>();
+					return result ?? ApiResponse.Success("更新成功。");
+				}
+				else
+				{
+					var errorContent = await response.Content.ReadAsStringAsync();
+					return ApiResponse.Error($"更新失败。状态码: {response.StatusCode}。详情: {errorContent}");
+				}
+			}
+			catch (HttpRequestException ex)
+			{
+				return ApiResponse.Error($"网络请求错误: {ex.Message}");
+			}
+		}
+	}
+}