- fetchConnectInfo: use window.location.protocol instead of hardcoded http://
- getBackendUrl: default to current origin when no ?backend= param
- Fixes mixed content errors on HTTPS Tailscale servers
- Also fixed: nginx needed reload on Tailscale servers, Arch 2 missing
/lnd-connect-info nginx location
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>