[Feature] rerank node supports matching threshold setting that meets direct answers

[xxyj6450]

MaxKB Version

1.10.2

Please describe your needs or suggestions for improvements

知识库检索支持返回一个满足直接回答的结果列表，希望rerank节点也支持此特性，以便于直接回答高匹配度的知识而减少不必要的大模型推理

Please describe the solution you suggest

1.rerank节点支持设定满足直接回答的阈值 2.rerank的输出变量中增加满足直接回答结果列表

Additional Information

No response

[baixin513]

感谢反馈，后续考虑一下

[shaohuzhang1]

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