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

Entities/Contracts/AssignmentQuestion.cs

@@ -48,6 +48,8 @@ namespace Entities.Contracts
 		[Column("score")]
 		public float? Score { get; set; }
 
+		public bool BCorrect { get; set; }
+
 		[Column("deleted")]
 		public bool IsDeleted { get; set; }
 

Entities/Contracts/Submission.cs

@@ -34,7 +34,7 @@ namespace Entities.Contracts
 		public DateTime SubmissionTime { get; set; }
 
 		[Column("overall_grade")]
-		public float? OverallGrade { get; set; }
+		public float OverallGrade { get; set; } = 0;
 
 		[Column("overall_feedback")]
 		public string? OverallFeedback { get; set; }

Entities/DTO/StudentDto.cs

@@ -13,8 +13,9 @@ namespace Entities.DTO
 		public string? DisplayName { get; set; }
 
 		public UInt32 ErrorQuestionNum { get; set; }
-		public Dictionary<QuestionType, UInt32> ErrorQuestionTypes { get; set; } = new Dictionary<QuestionType, UInt32>();	
+		public Dictionary<string, UInt32> ErrorQuestionTypes { get; set; } = new Dictionary<string, UInt32>();	
 		public Dictionary<SubjectAreaEnum, UInt32> SubjectAreaErrorQuestionDis { get; set; } = new Dictionary<SubjectAreaEnum, UInt32>();	
 		public Dictionary<byte, UInt32> LessonErrorDis { get; set; } = new Dictionary<byte, UInt32>();	
+		public float Score { get; set; }
 	}
 }

Entities/DTO/StudentSubmissionDetailDto.cs

@@ -0,0 +1,41 @@
+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+
+namespace Entities.DTO
+{
+    public class StudentSubmissionDetailDto
+    {
+        // 基本信息
+        public Guid Id { get; set; }
+        public Guid AssignmentId { get; set; }
+        public Guid StudentId { get; set; }
+        public DateTime SubmissionTime { get; set; }
+        public float OverallGrade { get; set; }
+        public string OverallFeedback { get; set; } = string.Empty;
+        public SubmissionStatus Status { get; set; }
+        
+        // Assignment信息
+        public AssignmentDto Assignment { get; set; } = new AssignmentDto();
+        
+        // 错误分析
+        public Dictionary<string, int> ErrorTypeDistribution { get; set; } = new Dictionary<string, int>();
+        public Dictionary<string, float> ErrorTypeScoreDistribution { get; set; } = new Dictionary<string, float>();
+        
+        // 成绩统计
+        public int TotalRank { get; set; }
+        public List<float> AllScores { get; set; } = new List<float>();
+        public float AverageScore { get; set; }
+        public float ClassAverageScore { get; set; }
+        
+        // 课文分布
+        public Dictionary<string, int> LessonErrorDistribution { get; set; } = new Dictionary<string, int>();
+        public Dictionary<string, int> KeyPointErrorDistribution { get; set; } = new Dictionary<string, int>();
+        
+        // 基础统计
+        public int TotalQuestions { get; set; }
+        public int CorrectCount { get; set; }
+        public int ErrorCount { get; set; }
+        public float AccuracyRate { get; set; }
+    }
+}

Entities/DTO/StudentSubmissionSummaryDto.cs

@@ -0,0 +1,22 @@
+using System;
+
+namespace Entities.DTO
+{
+    public class StudentSubmissionSummaryDto
+    {
+        public Guid Id { get; set; }
+        public string AssignmentName { get; set; }
+        public int ErrorCount { get; set; }
+        public DateTime CreatedDate { get; set; }
+        public float Score { get; set; }
+        public int TotalQuestions { get; set; }
+        public string StudentName { get; set; }
+        public string Status { get; set; }
+    }
+
+    public class StudentSubmissionSummaryResponseDto
+    {
+        public List<StudentSubmissionSummaryDto> Submissions { get; set; }
+        public int TotalCount { get; set; }
+    }
+}