caoxiaozhu
d139a63e64
refactor(server): 意图识别改 LLM 驱动,规则只做闲聊拦截+resume 兜底
规则不再判断'这是哪个业务场景'——那交给 LLM function call。
规则只保留两个不可替代职责:闲聊拦截(省 LLM 成本)、resume 确定性兜底。
- gate_classify 简化:删掉规则匹配门(94 词 CHOICE 匹配)和 ambiguous 提前判断
- 新增 _is_lightweight_off_topic:只拦 greeting+meaningless,不依赖业务关键词
- HANDLER_ONLY 改为 LLM 输出驱动:LLM 返回 query_travel_standard 后转 handler
- 图拓扑简化:gate_classify 只输出 off_topic|resume|model_intent
- 验证:76 passed;复合场景'出差并且报销招待费'→LLM 返回 2 task
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