feat: 添加复查功能和批量审核操作

- 复查功能: PUT /assessment/:id/review
  * 支持调整最终总分
  * 记录复查历史(reviewHistory)
  * 保存原始分数(originalScore)
  * 保留复查人、复查时间、复查意见

- 批量审核: POST /question-banks/:bankId/items/batch-review
  * 支持批量通过/拒绝题目
  * 可添加审核意见

- AssessmentSession实体: 添加复查相关字段

server/src/assessment/entities/assessment-session.entity.ts

@@ -61,6 +61,9 @@ export class AssessmentSession {
   @Column({ type: 'float', name: 'final_score', nullable: true })
   finalScore: number;
 
+  @Column({ type: 'float', name: 'original_score', nullable: true })
+  originalScore: number;
+
   @Column({ type: 'text', name: 'final_report', nullable: true })
   finalReport: string;
 
@@ -70,6 +73,18 @@ export class AssessmentSession {
   @Column({ type: 'simple-json', name: 'feedback_history', nullable: true })
   feedbackHistory: any[];
 
+  @Column({ name: 'reviewed_by', nullable: true, type: 'text' })
+  reviewedBy: string | null;
+
+  @Column({ name: 'reviewed_at', nullable: true, type: 'datetime' })
+  reviewedAt: Date | null;
+
+  @Column({ name: 'review_comment', nullable: true, type: 'text' })
+  reviewComment: string | null;
+
+  @Column({ type: 'simple-json', name: 'review_history', nullable: true })
+  reviewHistory: any[];
+
   @Column({ type: 'int', name: 'current_question_index', default: 0 })
   currentQuestionIndex: number;