API.1 Developer API: keys for licensed accounts, api.getcadcraft.com/v1, categories

The CadCraft API for people's own systems, on its own host. Licensed accounts make keys on /account/developers: scopes per category, one-workspace limit, expiry, allowed addresses, roll and revoke; the key is shown once. Categories: account, licenses, education, library, storage, projects, meta. Rate limits per key, Idempotency-Key on writes, cursor paging, and a log of each key's calls. Thin wrappers over the same services the website uses, so a key can never do more than its account. Test bin/test-a Discord member-api.php --http.