重构项目结构，移除Assignment相关功能，优化Submission模块

TechHelper.Server/Services/Exam/IExamQuestionService.cs

@@ -0,0 +1,19 @@
+using Entities.DTO;
+using TechHelper.Services;
+
+namespace TechHelper.Services.Beta
+{
+    public interface IExamQuestionService : IBaseService<ExamQuestionDto, Guid>
+    {
+        /// <summary>
+        /// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF>Ҫ<EFBFBD><D2AA>֪ʶ<D6AA><CAB6>,<2C>÷<EFBFBD><C3B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֲ<EFBFBD>,<2C><><EFBFBD><EFBFBD>ѧ<EFBFBD><D1A7><EFBFBD>б<EFBFBD>
+        /// </summary>
+        /// <param name="ExamQuestioId"></param>
+        /// <returns></returns>
+        Task<ApiResponse> GetQuestionDependy(QuesitionDenpendceyRequst request);
+
+        public record QuesitionDenpendceyRequst(Guid ExamQuestioId, Guid ClassId);
+
+        public record QuestionDependecyDto (LessonDto? Lesson, IEnumerable<float?> ScoreDistribution, IEnumerable<UserListDto> ErrorStudents);
+    }
+}