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复用统一的LLM调用, 原来的方法内部会默认不stream传输, 一些上游要求流式传输会出现问题 --------- Co-authored-by: 段舒康 <kdletters@qq.com> Reviewed-on: http://192.168.35.82/git/GenarrativeAI/Genarrative/pulls/235 Co-authored-by: 王德宇 <kvtodev@outlook.com> Co-committed-by: 王德宇 <kvtodev@outlook.com>