docs: add OpenZoo provider page under Connecting to LLMs

[staccDOTsol]

Updated 2026-09-02: corrected — the hosted https://api.openzoo.fun/v1 endpoint answers HTTP 402 to a plain OpenAI client (it only serves calls that pay x402 or carry an OpenZoo subscription key, ozk_live_…). The page now sets up the local npx openzoo proxy (http://localhost:8402/v1), which pays x402 per call from a local burner wallet and ignores the API key.

Adds a provider page for OpenZoo following the format of the existing llms/ pages (front matter self-registers under Connecting to LLMs, nav_order 500 like the other providers).

OpenZoo is an OpenAI-compatible provider that needs no signup — a local npx openzoo proxy pays per request over x402 and ignores the API key — so aider users can try it with npx openzoo plus the two env vars on the page (base http://localhost:8402/v1). It already works today via the generic openai-compat instructions; this page is purely discoverability.

Disclosure: I operate OpenZoo. Verification: npx openzoo then curl http://localhost:8402/v1/models is free and lists models + pricing; the page's env-var setup runs as-is against the proxy.

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[staccDOTsol]

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