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/Shared/ExamLayout.razor

@@ -1,16 +1,44 @@
 @inherits LayoutComponentBase
 @layout AccountLayout
+@inject NavigationManager NavigationManager
 
+<AuthorizeView Roles="Teacher">
+	<Authorized>
+		<MudPaper Class="d-flex flex-row flex-grow-1 overflow-hidden" Height="100%">
+			<MudPaper Width="200px">
+				<MudDivider Class="flex-grow-0" />
+				<ExamNavMenu />
+			</MudPaper>
+			<MudPaper Class="d-flex flex-grow-1 overflow-auto">
+				@Body
+			</MudPaper>
+		</MudPaper>
+	</Authorized>
+</AuthorizeView>
 
-<MudPaper Class="d-flex flex-row flex-grow-1 overflow-hidden" Height="100%">
+<AuthorizeView Roles="Student">
+	<Authorized>
+		<MudPaper Class="d-flex flex-row flex-grow-1 overflow-hidden" Height="100%">
+			<MudPaper Width="200px">
+				<MudDivider Class="flex-grow-0" />
+				<ExamNavMenu />
+			</MudPaper>
+			<MudPaper Class="d-flex h-100 w-100 flex-grow-1 overflow-auto">
+				@Body
+			</MudPaper>
+		</MudPaper>
+	</Authorized>
+</AuthorizeView>
 
-	<MudPaper Width="200px">
-		<MudDivider Class="flex-grow-0" />
-		<ExamNavMenu />
+@code {
+	[CascadingParameter]
+	private Task<AuthenticationState> authenticationStateTask { get; set; }
 
-	</MudPaper>
-
-	<MudPaper Class="flex-grow-1 overflow-auto">
-		@Body
-	</MudPaper>
-</MudPaper>
+	protected override void OnParametersSet()
+	{
+		if (authenticationStateTask is null)
+		{
+			NavigationManager.Refresh(forceReload: true);
+		}
+	}
+}