Add RouteScope — unified AI API gateway

[RouteScope]

What this changes

Checklist

• Edited data/providers.yaml only (not the README tables — they auto-regenerate)
• Followed data/schema.md
• status: unverified if I cannot independently verify (self-submissions default to this)
• No referral / affiliate links, no marketing copy
• notes is one factual sentence
• Claims have a dated source where non-obvious
• If adding a price fetcher: created fetchers/<id>.py, registered in fetchers/__init__.REGISTRY, added aliases to data/canonical-models.yaml

Source / verification

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Schema CI (pr-validate.yml) runs on every change to data/, fetchers/, scripts/, or pyproject.toml.
If you see a red ✗, scroll to the action log — it usually points to the exact field. Fix and push; CI re-runs automatically.