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.Server/Context/AutoMapperProFile.cs

@@ -58,6 +58,17 @@ namespace TechHelper.Context
 
 			CreateMap<SubmissionDetailDto, SubmissionDetail>().ReverseMap();
 
+			// Student Submission Detail
+			CreateMap<Submission, StudentSubmissionDetailDto>()
+				.ForMember(dest => dest.AssignmentId, opt => opt.MapFrom(src => src.AssignmentId))
+				.ForMember(dest => dest.StudentId, opt => opt.MapFrom(src => src.StudentId))
+				.ForMember(dest => dest.SubmissionTime, opt => opt.MapFrom(src => src.SubmissionTime))
+				.ForMember(dest => dest.OverallGrade, opt => opt.MapFrom(src => src.OverallGrade))
+				.ForMember(dest => dest.OverallFeedback, opt => opt.MapFrom(src => src.OverallFeedback))
+				.ForMember(dest => dest.Status, opt => opt.MapFrom(src => src.Status));
+
+			CreateMap<Assignment, AssignmentDto>().ReverseMap();
+
 
 			CreateMap<SubjectTypeMetadataDto, Global>()
 					   .ForMember(dest => dest.Info, opt => opt.MapFrom(src => JsonConvert.SerializeObject(src.Data)));