fix: Improve intent node

[shaohuzhang1]

fix: Improve intent node --bug=1062028 --user=张展玮 【应用编排】意图识别节点没有带上历史聊天记录进行分类 https://www.tapd.cn/62980211/s/1776831

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[shaohuzhang1]

No significant issues were found in the provided code. However, I suggest adding more detailed instructions about how to interpret and use historical conversations when determining the classification.

Optimization Suggestions:
It would also help if there was a placeholder or a method to extract relevant parts from previous interactions during the conversation (such as through metadata extraction) so that the model can better understand the context when making a classification decision.