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/Pages/Student/BaseInfoCard/StudentSubmissionPreviewTableCard.razor

@@ -1,39 +1,97 @@
-<MudPaper Class="ma-2 pa-2 rounded-xl d-flex flex-column flex-grow-1 overflow-auto" MaxHeight="100%">
+@using TechHelper.Client.Services
+@inject IStudentSubmissionService StudentSubmissionService
+
+<MudPaper Class="ma-2 pa-2 rounded-xl d-flex flex-column flex-grow-1 overflow-auto" MaxHeight="100%">
 
 	<StudentSubmissionPreviewCard />
-	@foreach (var submission in _studentSubmissions)
+	@if (_isLoading)
 	{
-		<StudentSubmissionPreviewCard StudentSubmission="@submission" />
+		<div class="d-flex justify-content-center align-items-center" style="height: 200px;">
+			<MudProgressCircular Color="Color.Primary" Size="Size.Large" />
+		</div>
+	}
+	else if (_studentSubmissions == null || _studentSubmissions.Count == 0)
+	{
+		<div class="d-flex justify-content-center align-items-center" style="height: 200px;">
+			<MudText TextColor="Color.TextSecondary" Align="Align.Center">暂无提交记录</MudText>
+		</div>
+	}
+	else
+	{
+		@foreach (var submission in _studentSubmissions)
+		{
+			<StudentSubmissionPreviewCard StudentSubmission="@submission" />
+		}
 	}
-
-
 </MudPaper>
 
 @code {
-	// 假设的学生提交数据模型
+	// 学生提交数据模型
 	public class StudentSubmission
 	{
 		public string StudentName { get; set; }
 		public int TotalProblems { get; set; }
 		public int ErrorCount { get; set; }
+		public DateTime CreatedDate { get; set; }
+		public float Score { get; set; }
+		public string AssignmentName { get; set; }
+		public string Status { get; set; }
 		public TimeSpan TimeSpent { get; set; }
-		public int Score { get; set; }
 	}
 
-	// 模拟数据列表
+	// 学生提交列表
 	private List<StudentSubmission> _studentSubmissions = new();
+	private bool _isLoading = true;
 
-	protected override void OnInitialized()
+	protected override async Task OnInitializedAsync()
 	{
-		// 模拟获取或初始化数据，实际应用中可能来自数据库或API
-		_studentSubmissions = new List<StudentSubmission>
-		{
-			new() { StudentName = "张三", TotalProblems = 10, ErrorCount = 2, TimeSpent = TimeSpan.FromMinutes(25), Score = 80 },
-			new() { StudentName = "李四", TotalProblems = 10, ErrorCount = 1, TimeSpent = TimeSpan.FromMinutes(20), Score = 90 },
-			new() { StudentName = "王五", TotalProblems = 10, ErrorCount = 5, TimeSpent = TimeSpan.FromMinutes(30), Score = 50 },
-			new() { StudentName = "赵六", TotalProblems = 10, ErrorCount = 3, TimeSpent = TimeSpan.FromMinutes(28), Score = 70 },
-			new() { StudentName = "钱七", TotalProblems = 10, ErrorCount = 0, TimeSpent = TimeSpan.FromMinutes(18), Score = 100 }
-            // ... 可以添加更多模拟数据
-        };
+		await LoadStudentSubmissions();
 	}
-}
+
+	private async Task LoadStudentSubmissions()
+	{
+		try
+		{
+			_isLoading = true;
+			StateHasChanged();
+
+			var result = await StudentSubmissionService.GetMySubmissionsAsync();
+			
+			if (result.Status && result.Result != null)
+			{
+				// 从服务器获取的数据映射到我们的模型
+				var submissions = result.Result as List<Entities.DTO.StudentSubmissionSummaryDto>;
+				
+				if (submissions != null)
+				{
+					_studentSubmissions = submissions.Select(submission => new StudentSubmission
+					{
+						AssignmentName = submission.AssignmentName,
+						CreatedDate = submission.CreatedDate,
+						ErrorCount = submission.ErrorCount,
+						Score = submission.Score,
+						StudentName = submission.StudentName,
+						Status = submission.Status,
+						TotalProblems = submission.TotalQuestions,
+						TimeSpent = TimeSpan.FromMinutes(30) // 默认值，实际应用中可以从服务器获取
+					}).ToList();
+				}
+			}
+			else
+			{
+				// 如果API调用失败，使用空列表
+				_studentSubmissions = new List<StudentSubmission>();
+			}
+		}
+		catch (Exception ex)
+		{
+			// 处理异常，可以记录日志
+			_studentSubmissions = new List<StudentSubmission>();
+		}
+		finally
+		{
+			_isLoading = false;
+			StateHasChanged();
+		}
+	}
+}