docs: add Kelly Intelligence example to other-models.md

[nicoletterankin]

What this adds

A small example block in the existing OpenAI-compatible models section of docs/other-models.md, showing how to use Kelly Intelligence via extra-openai-models.yaml.

Kelly Intelligence is a free OpenAI-compatible API with a built-in 162,000-word vocabulary RAG layer (601K translations across 47 languages) and an opinionated AI tutor persona ("Kelly"), built on top of Claude. It's operated by Lesson of the Day, PBC, a public benefit corporation. The free tier (500 calls/month) requires no credit card.

Why this is useful for llm users

llm users building education, language-learning, and writing-assistant tools frequently want a vocabulary RAG layer alongside their model calls. Because Kelly Intelligence is OpenAI-compatible, it's already supported by llm via the existing extra-openai-models.yaml mechanism — this PR just makes that more discoverable by adding a working example.

The example mirrors the shape of the existing LocalAI and OpenRouter examples already on this page.

Try it without an API key (for review)

Kelly Intelligence has a public /v1/demo endpoint, IP-rate-limited at 5 requests per hour, that you can hit with no signup at all:

curl -X POST https://api.thedailylesson.com/v1/demo \
  -H "Content-Type: application/json" \
  -d '{"messages":[{"role":"user","content":"What does ephemeral mean?"}]}'

This is the same wire format llm would use against Kelly via the documented yaml config.

Changes

• Modified: docs/other-models.md (+34 lines, 0 deletions) — adds an "Example: Kelly Intelligence" subsection in the existing "Extra HTTP headers" area, parallel to the OpenRouter example.

No code changes. No new files. The doc page already has a section dedicated to OpenAI-compatible models, so this slots in.

Checklist

• No code changes — docs-only
• No API keys or secrets in any file (verified via gitleaks-style scan)
• All URLs in this PR body and added file return HTTP 200
• Example mirrors the shape of the existing LocalAI / OpenRouter examples on the same page

[nicoletterankin]

Hi Simon — following up on this small docs addition. It adds Kelly Intelligence as an OpenAI-compatible provider example in other-models.md. The endpoint is live and functional. Happy to adjust the wording if you'd prefer a different format!