refactor(module-llm):优化知识库更新逻辑

- 在 updateKnowledgeBase 方法上添加 rollbackFor = Exception.class 参数
-确保在方法抛出任何异常时，事务都能正确回滚

yudao-module-llm/yudao-module-llm-biz/src/main/java/cn/iocoder/yudao/module/llm/service/knowledgebase/KnowledgeBaseServiceImpl.java

@@ -64,7 +64,7 @@ public class KnowledgeBaseServiceImpl implements KnowledgeBaseService {
     }
 
     @Override
-    @Transactional
+    @Transactional(rollbackFor = Exception.class)
     public void updateKnowledgeBase (KnowledgeBaseSaveReqVO updateReqVO) {
         // 1. 校验知识库是否存在
         validateKnowledgeBaseExists(updateReqVO.getId());