Bitcoin UI listens on 8334 internally (not 80), Electrs UI on 50002.
Port mappings must match: -p 8334:8334 and -p 50002:50002.
Also adds missing electrs-ui to the UI container list.
Removes --network host for bitcoin-ui which conflicted with nginx.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>