API route
POST /api/check
Run a Check: one Name across all five Registries, one Registry result each.
Send { "name": "<name>" }. The Name is validated against the Name validation rules first; an invalid Name gets 400 with the reason.
A valid Name is looked up on npm, Homebrew Formulae, Homebrew Cask, PyPI and GitHub in parallel. The answer has a results object with one Registry result per Registry, and warnings when PyPI normalization applies.