feat(pi-web-search): 统一 web_search/web_fetch 并由主模型路由搜索厂商

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7 个按厂商命名的搜索工具收敛为 2 个统一工具，schema 与提示词不再暴露
provider 概念：web_search 由当前主模型按内置规则在 Tavily/Exa/Keenable
间路由（会话内 LRU 缓存，失败按可用性降级），web_fetch 固定走 Exa 并
静默降级。三家均改为纯 fetch 直连——Exa 直接对 mcp.exa.ai 发 JSON-RPC
并缓存会话，彻底移除 pi-mcp-adapter、@tavily/pi-extension 与
@keenable/pi-search 依赖。

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

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云服务部-叶林立

2026-10-19 20:13:37 -07:00

co-authored by Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

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