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/assessment.service.ts

@@ -1438,4 +1438,53 @@ const initialState: Partial<EvaluationState> = {
       recentRecords,
     };
   }
+
+  async reviewAssessment(
+    sessionId: string,
+    newScore: number,
+    comment: string | undefined,
+    reviewerId: string,
+    tenantId: string,
+  ): Promise<AssessmentSession> {
+    const session = await this.sessionRepository.findOne({
+      where: { id: sessionId },
+    });
+
+    if (!session) {
+      throw new NotFoundException('Assessment session not found');
+    }
+
+    if (session.status !== AssessmentStatus.COMPLETED) {
+      throw new ForbiddenException('Can only review completed assessments');
+    }
+
+    const reviewRecord = {
+      reviewedBy: reviewerId,
+      reviewedAt: new Date().toISOString(),
+      originalScore: session.finalScore,
+      newScore: newScore,
+      comment: comment || '',
+    };
+
+    const reviewHistory = session.reviewHistory || [];
+    reviewHistory.push(reviewRecord);
+
+    if (!session.originalScore) {
+      session.originalScore = session.finalScore;
+    }
+
+    session.finalScore = newScore;
+    session.reviewedBy = reviewerId;
+    session.reviewedAt = new Date();
+    session.reviewComment = comment || null;
+    session.reviewHistory = reviewHistory;
+
+    await this.sessionRepository.save(session);
+
+    this.logger.log(
+      `[reviewAssessment] Session ${sessionId} reviewed by ${reviewerId}, score changed from ${reviewRecord.originalScore} to ${newScore}`,
+    );
+
+    return session;
+  }
 }