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/Services/StudentSubmissionService.cs

@@ -0,0 +1,142 @@
+using AutoMapper;
+using Entities.Contracts;
+using Entities.DTO;
+using Microsoft.EntityFrameworkCore;
+using SharedDATA.Api;
+using TechHelper.Context;
+using TechHelper.Repository;
+using TechHelper.Server.Repositories;
+using TechHelper.Services;
+
+namespace TechHelper.Server.Services
+{
+    public class StudentSubmissionService : IStudentSubmissionService
+    {
+        private readonly IUnitOfWork _unitOfWork;
+        private readonly IMapper _mapper;
+        private readonly IRepository<Submission> _submissionRepository;
+        private readonly IRepository<Assignment> _assignmentRepository;
+        private readonly IRepository<User> _userRepository;
+
+        public StudentSubmissionService(
+            IUnitOfWork unitOfWork, 
+            IMapper mapper,
+            IRepository<Submission> submissionRepository,
+            IRepository<Assignment> assignmentRepository,
+            IRepository<User> userRepository)
+        {
+            _unitOfWork = unitOfWork;
+            _mapper = mapper;
+            _submissionRepository = submissionRepository;
+            _assignmentRepository = assignmentRepository;
+            _userRepository = userRepository;
+        }
+
+        public async Task<ApiResponse> GetStudentSubmissionsAsync(Guid studentId)
+        {
+            try
+            {
+                var submissions = await _submissionRepository
+                    .GetAll(s => s.StudentId == studentId)
+                    .Include(s => s.Assignment)
+                    .ThenInclude(a => a.Creator)
+                    .OrderByDescending(s => s.SubmissionTime)
+                    .ToListAsync();
+
+                var result = new List<StudentSubmissionSummaryDto>();
+
+                foreach (var submission in submissions)
+                {
+                    var summary = new StudentSubmissionSummaryDto
+                    {
+                        Id = submission.Id,
+                        AssignmentName = submission.Assignment?.Title ?? "未知作业",
+                        ErrorCount = await CalculateErrorCountAsync(submission.Id),
+                        CreatedDate = submission.SubmissionTime,
+                        Score = (int)submission.OverallGrade,
+                        TotalQuestions = submission.Assignment?.TotalQuestions ?? 0,
+                        StudentName = submission.Assignment?.Creator?.UserName ?? "未知老师",
+                        Status = submission.Status.ToString()
+                    };
+                    result.Add(summary);
+                }
+
+                return ApiResponse.Success(result: result);
+            }
+            catch (Exception ex)
+            {
+                return ApiResponse.Error($"获取学生提交信息失败: {ex.Message}");
+            }
+        }
+
+        public async Task<ApiResponse> GetStudentSubmissionsPagedAsync(Guid studentId, int pageNumber = 1, int pageSize = 10)
+        {
+            try
+            {
+                var totalCount = await _submissionRepository
+                    .GetAll(s => s.StudentId == studentId)
+                    .CountAsync();
+
+                var submissions = await _submissionRepository
+                    .GetAll(s => s.StudentId == studentId)
+                    .Include(s => s.Assignment)
+                    .ThenInclude(a => a.Creator)
+                    .OrderByDescending(s => s.SubmissionTime)
+                    .Skip((pageNumber - 1) * pageSize)
+                    .Take(pageSize)
+                    .ToListAsync();
+
+                var result = new List<StudentSubmissionSummaryDto>();
+
+                foreach (var submission in submissions)
+                {
+                    var summary = new StudentSubmissionSummaryDto
+                    {
+                        Id = submission.Id,
+                        AssignmentName = submission.Assignment?.Title ?? "未知作业",
+                        ErrorCount = await CalculateErrorCountAsync(submission.Id),
+                        CreatedDate = submission.SubmissionTime,
+                        Score = submission.OverallGrade,
+                        TotalQuestions = submission.Assignment?.TotalQuestions ?? 0,
+                        StudentName = submission.Assignment?.Creator?.UserName ?? "未知老师",
+                        Status = submission.Status.ToString()
+                    };
+                    result.Add(summary);
+                }
+
+                var response = new StudentSubmissionSummaryResponseDto
+                {
+                    Submissions = result,
+                    TotalCount = totalCount
+                };
+
+                return ApiResponse.Success(result: response);
+            }
+            catch (Exception ex)
+            {
+                return ApiResponse.Error($"获取学生提交信息失败: {ex.Message}");
+            }
+        }
+
+        private async Task<int> CalculateErrorCountAsync(Guid submissionId)
+        {
+
+            var submissionDetails = await _unitOfWork.GetRepository<SubmissionDetail>()
+                .GetAll(sd => sd.SubmissionId == submissionId)
+                .ToListAsync();
+            return submissionDetails.Select(x => !x.IsCorrect).Count();
+        }
+
+        // 以下方法是IBaseService接口的实现，可以根据需要实现
+        public Task<ApiResponse> GetAllAsync() => throw new NotImplementedException();
+        public Task<ApiResponse> GetAsync(Guid id) => throw new NotImplementedException();
+        public Task<ApiResponse> AddAsync(StudentSubmissionSummaryDto model) => throw new NotImplementedException();
+        public Task<ApiResponse> UpdateAsync(StudentSubmissionSummaryDto model) => throw new NotImplementedException();
+        public Task<ApiResponse> DeleteAsync(Guid id) => throw new NotImplementedException();
+
+		public Task<ApiResponse> GetAllAsync(QueryParameter query)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}