Watchdogs/ folder + host conf rename

Move all watchdog scripts to a dedicated Watchdogs/ folder:
  Docker_Essentials/docker_watchdog.sh   → Watchdogs/
  unRAID_Essentials/system_watchdog.sh   → Watchdogs/
  unRAID_Essentials/resource_watchdog.sh → Watchdogs/
  Orchestrators/watchdog_orchestrator.sh → Watchdogs/
  Tools/watchdog_skip_list_manager.sh    → Watchdogs/

Rename host config files:
  master_host1.conf → host1.conf
  master_host2.conf → host2.conf

Update all references across the ecosystem:
  master.conf: WATCHDOG_ORCHESTRATOR_SCRIPTS paths → Watchdogs/
  load_config.sh: host*.conf glob + all comments
  git_pull_execute.sh: sparse checkout glob + all comments
  Partnership/ssh_setup.sh: HOST_CONF path construction
  user_script_plug-in.sh: all script paths + per-host conf path
  common.sh, README.md, README-User_Script_Plug-in.md: comment refs
  All Partnership, Fallback, Monitors, Transcodes, Tools scripts: comment refs

Orchestrators/daily_sync_maintenance.sh

@@ -53,7 +53,7 @@
 # Summary always shown — gives window timing and share/job counts.
 # Notify only on failure — successful daily maintenance doesn't need notification.
 #
-# ── CONFIGURATION (master.conf + master_host*.conf) ───────────────────────────────────────────
+# ── CONFIGURATION (master.conf + host*.conf) ───────────────────────────────────────────
 #   HOST*_DAILY_SYNC_SHARES      — shares pushed to mirror each day
 #   HOST*_PERSONAL_SHARES        — encrypted personal shares
 #   DAILY_MAINTENANCE_SCRIPTS    — maintenance jobs (permissions, cleanup, restart)
@@ -244,7 +244,7 @@ if ! check_rsync_enabled "DAILY"; then
     warn "Daily rsync disabled — skipping all $SHARE_COUNT share syncs"
     warn "Proceeding to maintenance jobs..."
 elif [[ "$SHARE_COUNT" -eq 0 ]]; then
-    warn "No shares configured for $MY_ID — check HOST*_DAILY_SYNC_SHARES in master_host*.conf"
+    warn "No shares configured for $MY_ID — check HOST*_DAILY_SYNC_SHARES in host*.conf"
 else
     # Pre-flight — connectivity then remote rootfs
     check_connectivity