Add auto-deployment infrastructure for all 4 LXCs

- Per-LXC deploy scripts (lxc151-hookshot, lxc106-cinny, lxc139-landing, lxc110-draupnir)
- Per-LXC webhook hook configs with unique HMAC-SHA256 secrets
- Livekit graceful restart script + systemd timer (waits for zero active calls)
- Fix hookshot/deploy.sh capitalization bug (Uptime-Kuma, Tinker-Tickets, etc.)

Each LXC independently clones repo and runs its own deploy.sh via adnanh/webhook on port 9000.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

systemd/livekit-graceful-restart.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Check every 5 minutes if a pending livekit restart can be applied
+
+[Timer]
+OnBootSec=5min
+OnUnitActiveSec=5min
+
+[Install]
+WantedBy=timers.target