Add north/south cameras, remove fullday, add verify-mvt.sh

- sky-cam.conf: CAMERAS now includes east, north, south with staggered
  SCHEDULE_SEASONS times (01:00, 01:30, 02:00); fullday schedules and
  tuning removed
- install.sh: fullday service/timer generation removed entirely
- fullday-video.sh + systemd units: deleted
- montage-mvt.sh: post-build technical checks (duration drift, video/audio
  stream presence) added; notification now includes check results and the
  exact verify-mvt.sh command to run
- verify-mvt.sh: new interactive CLI for montage review — shows checks,
  plays video, deletes source JPEG folders on approval, or re-runs montage

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

systemd/sky-cam-fullday.service

@@ -1,9 +0,0 @@
-[Unit]
-Description=Sky-Cam full-day timelapse (10-day retention)
-OnFailure=sky-cam-notify-failure@%n.service
-
-[Service]
-Type=oneshot
-ExecStart=/home/motion/drives/local-2tb/sunrise-scripts/fullday-video.sh
-StandardOutput=journal
-StandardError=journal

systemd/sky-cam-fullday.timer

@@ -1,9 +0,0 @@
-[Unit]
-Description=Sky-Cam full-day timelapse — 02:00
-
-[Timer]
-OnCalendar=*-*-* 02:00:00
-Persistent=true
-
-[Install]
-WantedBy=timers.target