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/Program.cs

@@ -45,6 +45,7 @@ builder.Services.AddScoped<IClassServices, ClasssServices>();
 builder.Services.AddScoped<IEmailSender, QEmailSender>();
 builder.Services.AddScoped<HttpInterceptorHandlerService>();
 builder.Services.AddScoped<IAIService, AiService>();
+builder.Services.AddScoped<INoteService, NoteService>();
 builder.Services.AddScoped<IUserServices, UserServices>();
 builder.Services.AddHttpClient("WebApiClient", client =>
 {