docs: add TokenLab base URL example for model router

[hedging8563]

Summary

• Add TokenLab as an OpenAI-compatible base URL example for registry-defined provider env vars.
• Keep the change docs-only and scoped to the project's existing OpenAI-compatible configuration surface.

Validation

• git diff --check

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Summary by cubic

Adds a TokenLab OpenAI-compatible example to the model router docs, showing how to set TOKENLAB_API_KEY and TOKENLAB_BASE_URL for registry-defined providers. This clarifies how to configure TokenLab with the router without code changes.

^{Written for commit 52caa1f. Summary will update on new commits.}

Summary by CodeRabbit

• Documentation
  • Clarified environment variable configuration for registry entries.
  • Added an example showing how to set custom API key and base URL variables for an OpenAI-compatible provider.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 52caa1f

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c3022a94-a11a-4111-9f68-23b0642ce51e

📥 Commits

Reviewing files that changed from the base of the PR and between c21aa3e and 52caa1f.

📒 Files selected for processing (1)

• website/docs/getting-started/model-router.md

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📝 Walkthrough

Walkthrough

Documentation update to model-router.md adding explanation and an example showing that registry entries can define custom environment variable names for API keys and base URLs, illustrated with a TokenLab configuration.

Changes

Documentation update

Layer / File(s)	Summary
Environment variables documentation website/docs/getting-started/model-router.md	Documents that registry entries can specify custom API key and base URL environment variable names, with a TokenLab example (TOKENLAB_API_KEY, TOKENLAB_BASE_URL).

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description omits most required template sections, including checklist items, current/new behavior, linked issue, and reviewer notes.	Add the missing PR template sections: checklist, bugs/features details, current/new behavior, linked issue, and reviewer notes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately describes the docs-only TokenLab base URL example change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}