Salvage of PR #1707 by @kshitijk4poor (cherry-picked with authorship preserved). Adds Tavily as a third web backend alongside Firecrawl and Parallel, using the Tavily REST API via httpx. - Backend selection via hermes tools → saved as web.backend in config.yaml - All three tools supported: search, extract, crawl - TAVILY_API_KEY in config registry, doctor, status, setup wizard - 15 new Tavily tests + 9 backend selection tests + 5 config tests - Backward compatible Closes #1707
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