Critical: headless services (Bitcoin, LND, Electrumx) need companion
UI containers that serve web dashboards. These were only built for
Bitcoin, and only on bundled ISO builds.
Changes:
- install.rs: auto-build UI containers for LND (port 8081) and
Electrumx (port 50002) in addition to Bitcoin (port 8334)
- build-auto-installer-iso.sh: always bundle docker UI source files
(was skipping for unbundled builds — they're tiny HTML, not images)
- Dockerfiles: fix nginx base image tag 1.29.6→1.27.4 (matches registry)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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