renjianbo c5659c4537 feat: multi-backend web_search with Bing API + DuckDuckGo fallback ...

web_search_tool now tries Bing Web Search API first (works in China, free tier
1000 searches/month via Azure), then falls back to DuckDuckGo. Both backends
support optional SEARCH_PROXY for network-restricted environments.

New settings:
- BING_SEARCH_API_KEY: Azure Bing Search API key
- SEARCH_PROXY: HTTP proxy for outbound search requests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-05-08 00:06:45 +08:00

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