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.Server/Services/IStudentSubmissionService.cs

@@ -0,0 +1,24 @@
+using Entities.DTO;
+using TechHelper.Services;
+
+namespace TechHelper.Server.Services
+{
+    public interface IStudentSubmissionService : IBaseService<StudentSubmissionSummaryDto, Guid>
+    {
+        /// <summary>
+        /// 获取学生提交的作业摘要列表
+        /// </summary>
+        /// <param name="studentId">学生ID</param>
+        /// <returns>学生提交摘要列表</returns>
+        Task<ApiResponse> GetStudentSubmissionsAsync(Guid studentId);
+
+        /// <summary>
+        /// 获取学生提交的作业摘要列表（分页）
+        /// </summary>
+        /// <param name="studentId">学生ID</param>
+        /// <param name="pageNumber">页码</param>
+        /// <param name="pageSize">每页数量</param>
+        /// <returns>分页的学生提交摘要列表</returns>
+        Task<ApiResponse> GetStudentSubmissionsPagedAsync(Guid studentId, int pageNumber = 1, int pageSize = 10);
+    }
+}