Scan-to-connect only worked on the same Wi-Fi because the QR carried a LAN
relay URL. Give the relay a public address two ways:
- `npm run dev:tunnel` (scripts/dev-tunnel.mjs) opens a cloudflared tunnel
to localhost:4000 and starts the backend with PUBLIC_RELAY_URL set to the
public https URL, so the QR carries it and a phone on any network connects.
- Deploy configs for Fly.io (fly.toml), Render (render.yaml), and Railway
(railway.json), all building the existing Dockerfile.
Also harden resolveRelayUrl to honor x-forwarded-proto so the derived QR URL
is https behind a TLS proxy (iOS ATS requires wss).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Khalid Abdi