Add llm-openzoo to plugin directory

[staccDOTsol]

Adds llm-openzoo (PyPI) to the Remote APIs section.

It mirrors llm-openrouter's structure: models fetched from the model catalog at <base>/models (hourly cache in llm.user_dir()), registered as openzoo/<model-id>, with llm openzoo models/refresh commands. The base defaults to OpenZoo's local proxy, http://localhost:8402/v1 (npx openzoo, override with OPENZOO_API_BASE), which speaks the OpenAI API and pays for each call over x402 from a local burner wallet — no account, no API key. The proxy ignores the key, so get_key() falls back to a placeholder instead of erroring: npx openzoo then llm -m openzoo/z-ai/glm-5.3-flash 'hi' works with no key setup. When the proxy is not running the plugin falls back to the free hosted catalog so llm models still lists them. The hosted gateway https://api.openzoo.fun/v1 itself answers 402 unless the caller pays x402 or presents an OpenZoo subscription key (llm keys set openzoo).

Disclosure: I operate OpenZoo.

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