docs: design for web search via SearXNG

Model-decided tool calling against a SearXNG instance, with the loop
inside stream_chat, results shown as a collapsible block, and a cap of
two searches per turn.

Verified against the live stack before writing: Qwen3.5-9B through the
router emits well-formed tool_calls and answers correctly from a
role: "tool" result. No llama-server flags are involved; the shipped
--tools option runs server-side tools and none of them search the web.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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