Add the Docker Registry v2 token endpoint (GET /v2/token) and switch the
/v2 401 challenge from Basic to a Bearer realm pointing at it. The endpoint
verifies the caller's existing AWS:<jwt> credential and re-mints a fresh
full-TTL token, providing the token-refresh path for OCI clients (docker,
crane, skopeo). The auth bridge still accepts Basic AWS:<jwt> directly.
Josh Siviour
bd77ea8ee1