feat(jmri): headless JMRI server with Leviton layout power monitor and X11 GUI mode

- Stable udev device symlinks (/dev/jmri/nce, /dev/jmri/loconet, /dev/jmri/lcc)
- jmri-monitor: polls Leviton Decora Smart switch to start/stop JMRI automatically
  - Quiet hours 1-10 AM (no polling)
  - 30s off-delay before shutdown
- LCRR config cloned from Gitea (ssh://gitea.mk-labs.cloud:2221/rblundon/LCRR.git)
- ~/.jmri symlinked to LCRR repo for GitOps config management
- jmri-gui: X11 remote GUI access (PanelPro/DecoderPro) via ssh -X as jmri user
  - Stops daemon, launches GUI, restarts daemon on exit if layout still on
- jmri user gets login shell + SSH key for GUI sessions
- Full JRE installed (openjdk-21-jre) for AWT/X11 support

graphify-out/cache/ast/5b5bd53d1192f2c4b80b3d2c6cccb5a5d155de2ad8d781e4cebd2ba03f2db894.json

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graphify-out/cache/ast/856a78fcc41f33abb8b8b3e006a22aef01547e332490e54dfcbe85f8543bae7f.json

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graphify-out/cache/ast/c4db6a3b575d0b089164a117fe151ac8bd3c9abf1248e9a62401812ddd5621bc.json

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