Browsers don't reliably replay Basic-auth credentials on a WebSocket upgrade,
so the dashboard's live feed was stuck on "reconnecting" (only the 5s REST
poll worked). Give /api/ws a higher-priority Traefik router that skips Basic
auth; the backend still requires API_TOKEN, which nginx injects on the
handshake. The deploy now fails closed unless CRYPTO_API_TOKEN is set.
Also: split the nginx /api/ws block so upgrade headers are only set there, and
add reconnect backoff (2s -> 30s) so a failing socket stops hammering.
matitos