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/Exam/Index.razor

@@ -1,7 +1,34 @@
 @page "/exam"
+@using TechHelper.Client.Pages.Student.BaseInfoCard
+@inject NavigationManager NavigationManager
+
+<AuthorizeView Roles="Teacher">
+	<Authorized>
+		<MudPaper Class="rounded-xl ma-2 px-2 overflow-auto w-100 h-100">
+			<StudentSubmissionPreviewTableCard />
+		</MudPaper>
+	</Authorized>
+</AuthorizeView>
 
 
-<MudText>HELLO WORLD</MudText>
+<AuthorizeView Roles="Student">
+	<Authorized>
+		<MudPaper Class="rounded-xl ma-2 px-2 overflow-auto w-100 h-100">
+			<StudentSubmissionPreviewTableCard />
+		</MudPaper>
+	</Authorized>
+</AuthorizeView>
 @code {
 
+
+	[CascadingParameter]
+	private Task<AuthenticationState> authenticationStateTask { get; set; }
+
+	protected override void OnParametersSet()
+	{
+		if (authenticationStateTask is null)
+		{
+			NavigationManager.Refresh(forceReload: true);
+		}
+	}
 }