Fix dead/incorrect vars in Plugin/ found during full codebase audit

- WEBGUI_PHP_WAIT was referenced by webgui_watchdog.sh but never defined
  in master.conf, always silently falling back to a hardcoded default
- arrs.php/confform.php still pointed at Media/ for arr cleanup/discovery
  scripts moved to Arrs_Stack/ in b4bc926 — broke the Arrs page's stats
  and the per-script settings editor for those scripts
- docker_folders.php read directly from the optional folder.view3 plugin's
  file instead of Varaverk's own docker_folders.json (the primary store
  since the Docker tab got its own config) — left the Monitor page's
  Docker Folders widget empty on any host without folder.view3 installed
- vv_wd_remote_data() read remote watchdog state files from hardcoded
  /tmp or /boot/config paths instead of the remote's actual STATE_DIR
  (which resolves dynamically and can differ under flash mode) — remote
  node's Watchdog panel was always empty; same wrong path also used for
  two local reads (system_watchdog_oom.db, watchdog_appdata_growth.db)
- rsync.php referenced a {HOST}_MONTHLY_SYNC_SHARES conf var that never
  existed (monthly_maintenance.sh has no rsync section) — nulled out to
  match the existing pattern used for the fallback window
- vv_arr_node_names() did a pointless identity array_map
- vv_dk_webui() had its own duplicate local-IP resolution instead of
  using vv_local_ip(), despite config.php's comment claiming that exact
  duplication was already consolidated

Plugin/unraid/include/docker_folders.php

@@ -1,5 +1,6 @@
 <?php
 require_once __DIR__ . '/config.php';
+require_once __DIR__ . '/docker.php';
 
 function vv_container_webui(string $name, array $portMap): string {
     $template = '/boot/config/plugins/dockerMan/templates-user/my-' . $name . '.xml';
@@ -22,10 +23,10 @@ function vv_container_webui(string $name, array $portMap): string {
 }
 
 function vv_get_docker_folders(): array {
-    $folderFile = '/boot/config/plugins/folder.view3/docker.json';
-    $folderData = file_exists($folderFile)
-        ? (json_decode(@file_get_contents($folderFile), true) ?: [])
-        : [];
+    // Varaverk's own docker_folders.json is the primary store (see include/docker.php) —
+    // reading folder.view3's mirror directly here left this widget empty on any host
+    // without that optional third-party plugin installed.
+    $folderData = vv_dk_read_json();
 
     // One docker ps call: names, status, port mappings
     $raw = shell_exec("docker ps -a --format '{{.Names}}\t{{.Status}}\t{{.Ports}}' 2>/dev/null") ?? '';