fix stale doc references across four files

README.md:
  - folder tree: conf files at root → Configurations/ subfolder
  - folder tree: Failover/ → Fallback/, wrong README name corrected
  - folder tree: add Kernel/ entry (was missing)
  - CONFIGURATION section: note Configurations/ path + sparse checkout

README-User_Script_Plug-in.md:
  - mem_shutdown_active attributed to stability_watchdog → resource_watchdog

unRAID_Essentials/README-Unraid_Essentials.md:
  - webgui_watchdog schedule: "Every 10 min via User Scripts" →
    "Every minute via watchdog_orchestrator → system_watchdog"
  - HOW THE SCRIPTS RELATE: arrow diagram corrected — system_watchdog.sh
    calls storage/webgui/network watchdogs, not the reverse; added
    network_watchdog.sh and stability_watchdog.sh to the flow

Orchestrators/README-Orchestrators.md:
  - continuous daemon example: system_watchdog.sh → fallback.sh
    (system_watchdog is now single-pass, not a daemon)
  - scripts table: add watchdog_orchestrator.sh and monthly_maintenance.sh
    (both were missing)

unRAID_Essentials/README-Unraid_Essentials.md

@@ -110,7 +110,7 @@ Watchdogs/
 
 | Script | Role | When It Runs |
 |--------|------|-------------|
-| `webgui_watchdog.sh` | WebGUI availability — nginx → php-fpm → emhttp | Every 10 min via User Scripts |
+| `webgui_watchdog.sh` | WebGUI availability — nginx → php-fpm → emhttp | Every minute via watchdog_orchestrator → system_watchdog |
 | `inotify_tuning.sh` | Raise inotify kernel limits | At array start — FIRST |
 | `php_fpm_max_children.sh` | Set PHP-FPM max worker count | At array start |
 | `docker_syslog_filter.sh` | Suppress Docker veth syslog noise | At array start — before containers |
@@ -132,19 +132,21 @@ Array starts
     └─ php_fpm_max_children.sh ← before WebGUI is under load
 
 Every minute (watchdog_orchestrator.sh in Orchestrators/):
-    → Watchdogs/resource_watchdog.sh → Watchdogs/docker_watchdog.sh
-    → Watchdogs/System/storage_watchdog.sh  → Watchdogs/system_watchdog.sh
+    → Watchdogs/resource_watchdog.sh
+    → Watchdogs/docker_watchdog.sh
+    → Watchdogs/system_watchdog.sh (thin orchestrator)
+        └─ Watchdogs/System/storage_watchdog.sh
+        └─ Watchdogs/System/webgui_watchdog.sh
+               WebGUI OK → silent exit
+               Not responding:
+                 Step 1: restart nginx       → recheck
+                 Step 2: restart php-fpm     → recheck
+                 Step 3: restart emhttp      → recheck
+                 All failed → notify, exit 1
+        └─ Watchdogs/System/network_watchdog.sh
+    → Watchdogs/stability_watchdog.sh
     (see Watchdogs/README-Watchdogs.md for full flow)
 
-Every 10 minutes (User Scripts):
-    └─ webgui_watchdog.sh
-         WebGUI OK → silent exit
-         Not responding:
-           Step 1: restart nginx       → recheck
-           Step 2: restart php-fpm     → recheck
-           Step 3: restart emhttp      → recheck
-           All failed → notify, exit 1
-
 Weekly (weekly_maintenance.sh):
     └─ clear_logs.sh
          System logs: clear if > LOG_MIN_SIZE_MB