Create API key - SeaOtter

Creates an org-scoped control-plane API key. The full secret (so_…) is returned once in secret. Creating keys requires a Clerk session (Settings UI or Bearer JWT) with org admin. After that, use the so_ key for scripts and the docs playground.

# While authenticated with a Clerk JWT:
curl -sS -X POST "$SEAOTTER_API/api/v1/api-keys" \
  -H "Authorization: Bearer $CLERK_JWT" \
  -H "Content-Type: application/json" \
  -d '{"name":"docs-try-it"}'