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/controllers/question-bank.controller.ts

@@ -133,4 +133,18 @@ export class QuestionBankController {
       req.user.tenantId,
     );
   }
+
+  @Post(':bankId/items/batch-review')
+  async batchReviewItems(
+    @Param('bankId') bankId: string,
+    @Body() body: { itemIds: string[]; approved: boolean; comment?: string },
+  ) {
+    this.logger.log(`[batchReview] Reviewing ${body.itemIds.length} items, approved: ${body.approved}`);
+    return this.questionBankService.batchReviewItems(
+      bankId,
+      body.itemIds,
+      body.approved,
+      body.comment,
+    );
+  }
 }