List this account's API keys using display-safe metadata only.

Costs nothing quota-wise and never returns a raw key or key hash. Each row includes the id needed by rotate/revoke plus key_prefix, name, scopes, created_at, last_used_at, and revoked_at. Recover from scope_missing with an account:read key; for rate_limited or service_unavailable, wait for retry_after_sec and retry once without inferring that a key disappeared.