Bumps users.token_revoked_before = now() for the calling user, audited
under AuditCategory.AUTH. Best-effort: returns 204 even when the request
is unauthenticated, so the SPA can call it on every logout regardless of
token state. Token-rejection is enforced by the existing
JwtAuthenticationFilter revocation check (fixed in 7066795c).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>