refactor(yudao-module-llm): 优化数据回流 response 处理

- 使用 "(?s)" 标志使 "."匹配换行符，确保<think> 标签内的内容被正确替换
- 添加 trim() 方法去除回答两端的空白字符，提高数据准确性

yudao-module-llm/yudao-module-llm-biz/src/main/java/cn/iocoder/yudao/module/llm/service/conversation/ConversationServiceImpl.java

@@ -532,7 +532,7 @@ public class ConversationServiceImpl implements ConversationService {
         dataRefluxDataSaveReqVO.setModelType(chatReqVO.getModelType());
         dataRefluxDataSaveReqVO.setPrompt(chatReqVO.getPrompt());
         dataRefluxDataSaveReqVO.setSystem(modelCompletionsRespVO.getSystem());
-        dataRefluxDataSaveReqVO.setResponse(modelCompletionsRespVO.getAnswer().replaceAll("<think>.*?</think>", ""));
+        dataRefluxDataSaveReqVO.setResponse(modelCompletionsRespVO.getAnswer().replaceAll("(?s)<think>.*?</think>", "").trim());
         dataRefluxDataSaveReqVO.setMaxTokens(chatReqVO.getMaxTokens());
         dataRefluxDataSaveReqVO.setTemperature(chatReqVO.getTemperature());
         dataRefluxDataService.saveDataRefluxData(dataRefluxDataSaveReqVO);