feat: 添加学生提交系统功能

- 添加学生提交管理服务 (StudentSubmissionService, StudentSubmissionDetailService)
- 新增学生提交相关控制器 (StudentSubmissionController, StudentSubmissionDetailController)
- 添加学生提交数据传输对象 (StudentSubmissionDetailDto, StudentSubmissionSummaryDto)
- 新增学生提交相关页面组件 (StudentExamView, ExamDetailView, StudentCard等)
- 添加学生提交信息卡片组件 (SubmissionInfoCard, TeacherSubmissionInfoCard)
- 更新数据库迁移文件以支持提交系统

TechHelper.Client/Program.cs

@@ -39,6 +39,8 @@ builder.Services.AddLocalStorageServices();
 
 builder.Services.AddScoped<IAuthenticationClientService, AuthenticationClientService>();
 builder.Services.AddScoped<IExamService, ExamService>();
+builder.Services.AddScoped<IStudentSubmissionService, StudentSubmissionService>();
+builder.Services.AddScoped<IStudentSubmissionDetailService, StudentSubmissionDetailService>();
 builder.Services.AddScoped<AuthenticationStateProvider, AuthStateProvider>();
 builder.Services.AddScoped<IRefreshTokenService, RefreshTokenService>();
 builder.Services.AddScoped<IClassServices, ClasssServices>();