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/services/question-bank.service.ts

@@ -406,4 +406,38 @@ export class QuestionBankService {
     );
     return selected;
   }
+
+  async batchReviewItems(
+    bankId: string,
+    itemIds: string[],
+    approved: boolean,
+    comment?: string,
+  ): Promise<QuestionBankItem[]> {
+    await this.findOne(bankId);
+    
+    const items = await this.itemRepository.find({
+      where: itemIds.map(id => ({ id, bankId })),
+    });
+
+    if (items.length !== itemIds.length) {
+      throw new NotFoundException('Some items not found');
+    }
+
+    const newStatus = approved 
+      ? QuestionBankItemStatus.PUBLISHED 
+      : QuestionBankItemStatus.PENDING_REVIEW;
+
+    for (const item of items) {
+      item.status = newStatus;
+      if (comment) {
+        item.basis = item.basis 
+          ? `${item.basis}\n[审核意见]: ${comment}` 
+          : `[审核意见]: ${comment}`;
+      }
+    }
+
+    await this.itemRepository.save(items);
+    this.logger.log(`[batchReview] ${items.length} items ${approved ? 'approved' : 'rejected'}`);
+    return items;
+  }
 }