Structural reorganization: watchdog taxonomy + server_reboot integration

Watchdog renames and moves:
  system_watchdog.sh → stability_watchdog.sh (last line of defense — reboots)
  storage_watchdog.sh → Watchdogs/System/storage_watchdog.sh
  webgui_restart.sh → Watchdogs/System/webgui_watchdog.sh (renamed to match folder convention)

New thin orchestrator:
  Watchdogs/system_watchdog.sh — runs SYSTEM_WATCHDOG_SCRIPTS from master.conf
  Sits between docker_watchdog and stability_watchdog in the orchestrator tier chain
  System/ subfolder is the growth seam for future system component watchdogs

master.conf:
  WATCHDOG_ORCHESTRATOR_SCRIPTS updated — storage removed, system_watchdog added as tier
  SYSTEM_WATCHDOG_SCRIPTS array added — storage + webgui

server_reboot.sh:
  Calls array_stopping.sh before VM shutdown for guaranteed safe array stop
  Removed raw rc.docker stop and exit trap — orchestrator owns container shutdown

user_script_plug-in.sh

@@ -25,7 +25,7 @@
 #   weekly_sync_maintenance.sh        2:30am Sunday — clean sync + image updates
 #   sunday_morning_coffee_report.sh   7am Sunday    — full weekly digest
 #   weekly_health_digest.sh           8am daily     — profile-controlled health notification
-#   webgui_restart.sh                 every 10 min  — WebGUI availability watchdog
+#   webgui_watchdog.sh                 every 10 min  — WebGUI availability watchdog
 #   system_tuning_monitor.sh          every 6 hours — inotify + php-fpm trend tracking
 #   clear_logs.sh                     5am Sunday    — size-threshold log cleanup
 #   [Sunday monitor block]            6am-11am Sun  — certs, SMART, backups, reports
@@ -401,7 +401,7 @@
 #   4. Restart emhttp (core daemon)    wait WEBGUI_EMHTTP_WAIT=30s, recheck
 #   5. All failed → notify warning, manual intervention needed
 #
-# bash /mnt/user/appdata/unraid_scripts/unRAID_Essentials/webgui_restart.sh
+# bash /mnt/user/appdata/unraid_scripts/Watchdogs/System/webgui_watchdog.sh
 
 
 # ── SYSTEM TUNING MONITOR ────────────────────────────────────────────────────────────────────
@@ -733,8 +733,8 @@
 # Reboot loop protection: N reboots in X hours → shutdown instead.
 # State file heartbeat: writes watchdog_cycle=N every cycle (docker_watchdog stale guard).
 #
-# bash /mnt/user/appdata/unraid_scripts/Watchdogs/system_watchdog.sh --status
-# bash /mnt/user/appdata/unraid_scripts/Watchdogs/system_watchdog.sh --dry-run
+# bash /mnt/user/appdata/unraid_scripts/Watchdogs/stability_watchdog.sh --status
+# bash /mnt/user/appdata/unraid_scripts/Watchdogs/stability_watchdog.sh --dry-run
 
 # resource_watchdog.sh — three-level pressure reduction layer (single-pass, called by watchdog_orchestrator)
 # Reduces system load intelligently BEFORE docker_watchdog attempts container restarts.
@@ -787,9 +787,9 @@
 # bash /mnt/user/appdata/unraid_scripts/unRAID_Essentials/docker_syslog_filter.sh --status
 # bash /mnt/user/appdata/unraid_scripts/unRAID_Essentials/docker_syslog_filter.sh
 
-# webgui_restart.sh — WebGUI availability watchdog (see ORCHESTRATORS section above)
-# bash /mnt/user/appdata/unraid_scripts/unRAID_Essentials/webgui_restart.sh --dry-run
-# bash /mnt/user/appdata/unraid_scripts/unRAID_Essentials/webgui_restart.sh --status
+# webgui_watchdog.sh — WebGUI availability watchdog (see ORCHESTRATORS section above)
+# bash /mnt/user/appdata/unraid_scripts/Watchdogs/System/webgui_watchdog.sh --dry-run
+# bash /mnt/user/appdata/unraid_scripts/Watchdogs/System/webgui_watchdog.sh --status
 
 # clear_logs.sh — size-threshold log cleanup (see ORCHESTRATORS section above)
 # bash /mnt/user/appdata/unraid_scripts/unRAID_Essentials/clear_logs.sh --dry-run
@@ -1301,7 +1301,7 @@
 #   Orchestrators/transcode_management.sh
 #
 # */10 * * * *   every 10 minutes:
-#   unRAID_Essentials/webgui_restart.sh
+#   Watchdogs/System/webgui_watchdog.sh
 #
 # */15 * * * *   every 15 minutes:
 #   Orchestrators/critical_sync_maintenance.sh