重构作业结构：优化实体模型、DTO映射和前端界面

- 重构AppMainStruct、AssignmentQuestion、Question等实体模型
- 更新相关DTO以匹配新的数据结构
- 优化前端页面布局和组件
- 添加全局信息和笔记功能相关代码
- 更新数据库迁移和程序配置

TechHelper.Client/Pages/Student/BaseInfoCard/StudentSubmissionPreviewTableCard.razor

@@ -0,0 +1,39 @@
+<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)
+	{
+		<StudentSubmissionPreviewCard StudentSubmission="@submission" />
+	}
+
+
+</MudPaper>
+
+@code {
+	// 假设的学生提交数据模型
+	public class StudentSubmission
+	{
+		public string StudentName { get; set; }
+		public int TotalProblems { get; set; }
+		public int ErrorCount { get; set; }
+		public TimeSpan TimeSpent { get; set; }
+		public int Score { get; set; }
+	}
+
+	// 模拟数据列表
+	private List<StudentSubmission> _studentSubmissions = new();
+
+	protected override void OnInitialized()
+	{
+		// 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
+        };
+	}
+}