Short hostname "trade" (matches /trade HTTPRoute) instead of "trading-dashboard".
This fixes the "Could not resolve host: trading-dashboard" error on tailnet devices while keeping the same annotation style as Grafana.
Matches the exact annotation pattern used for other tailnet services (Grafana, trade-dashboard, hermes-webui, etc.).
This ensures the Tailscale operator correctly maps the exposed port after the 3000 change.