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/StudentSubmissionPreviewCard.razor

@@ -0,0 +1,28 @@
+@using static TechHelper.Client.Pages.Student.BaseInfoCard.StudentSubmissionPreviewTableCard
+
+
+@if(StudentSubmission!=null)
+{
+    <MudPaper Class="ma-2 pa-2 rounded-xl d-flex w-100 flex-nowrap">
+        <MudText Class="flex-grow-0 flex-shrink-0" Style="width:60%">               @StudentSubmission.StudentName </MudText>
+        <MudText Class="flex-grow-0 flex-shrink-0 text-start" Style="width:10%">  @StudentSubmission.TotalProblems </MudText>
+        <MudText Class="flex-grow-0 flex-shrink-0 text-start" Style="width:10%"> @StudentSubmission.ErrorCount </MudText>
+        <MudText Class="flex-grow-0 flex-shrink-0 text-start" Style="width:10%"> @StudentSubmission.TimeSpent </MudText>
+        <MudText Class="flex-grow-0 flex-shrink-0 text-start" Style="width:10%"> @StudentSubmission.Score </MudText>
+    </MudPaper>
+}
+else
+{
+    <MudPaper Class="ma-1 pa-2 rounded-xl d-flex w-100 flex-nowrap">
+        <MudText Class="flex-grow-0 flex-shrink-0" Style="width:60%">  名称 </MudText>
+        <MudText Class="flex-grow-0 flex-shrink-0 text-start" Style="width:10%"> 题目总数 </MudText>
+        <MudText Class="flex-grow-0 flex-shrink-0 text-start" Style="width:10%"> 错误总数 </MudText>
+        <MudText Class="flex-grow-0 flex-shrink-0 text-start" Style="width:10%"> 时间 </MudText>
+        <MudText Class="flex-grow-0 flex-shrink-0 text-start" Style="width:10%"> 得分 </MudText>
+    </MudPaper>
+}
+@code{
+
+    [Parameter]
+    public StudentSubmission StudentSubmission{ get; set; }
+}