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/arrs.php

@@ -14,7 +14,7 @@ function vv_arr_known_hosts(): array {
 }
 
 function vv_arr_node_names(): array {
-    return array_map(fn($name) => $name, vv_arr_known_hosts());
+    return vv_arr_known_hosts();
 }
 
 // ── Discovery ─────────────────────────────────────────────────────────────────
@@ -123,9 +123,9 @@ function vv_fetch_arr_live(array $arr): array {
 // ── Log stats ─────────────────────────────────────────────────────────────────
 
 function vv_arr_cleanup_stats(string $type): array {
-    $slugs = ['sonarr' => 'Media/sonarr_cleanup',
-              'radarr' => 'Media/radarr_cleanup',
-              'lidarr' => 'Media/lidarr_cleanup'];
+    $slugs = ['sonarr' => 'Arrs_Stack/sonarr_cleanup',
+              'radarr' => 'Arrs_Stack/radarr_cleanup',
+              'lidarr' => 'Arrs_Stack/lidarr_cleanup'];
     $base = LOG_DIR . '/' . ($slugs[$type] ?? '');
     $out  = ['last_run' => null, 'end' => null, 'status' => null,
              'tracked'  => null, 'total' => null,
@@ -181,9 +181,9 @@ function vv_arr_cleanup_stats(string $type): array {
 }
 
 function vv_arr_discovery_stats(string $type): array {
-    $slugs = ['sonarr' => 'Media/playback_aware_sonarr_discovery',
-              'radarr' => 'Media/playback_aware_radarr_discovery',
-              'lidarr' => 'Media/playback_aware_lidarr_discovery'];
+    $slugs = ['sonarr' => 'Arrs_Stack/playback_aware_sonarr_discovery',
+              'radarr' => 'Arrs_Stack/playback_aware_radarr_discovery',
+              'lidarr' => 'Arrs_Stack/playback_aware_lidarr_discovery'];
     $base = LOG_DIR . '/' . ($slugs[$type] ?? '');
     $out  = ['last_run' => null, 'status' => null, 'added' => null];
 
@@ -225,7 +225,7 @@ function vv_arr_discovery_stats(string $type): array {
 }
 
 function vv_arr_sync_stats(): array {
-    $base = LOG_DIR . '/Media/arr_sync';
+    $base = LOG_DIR . '/Arrs_Stack/arr_sync';
     $out  = ['last_run' => null, 'status' => null, 'added' => null,
              'nodes'    => null, 'blocklist_count' => null];
 
@@ -255,7 +255,7 @@ function vv_arr_sync_stats(): array {
 }
 
 function vv_arr_recovery_stats(): array {
-    $base = LOG_DIR . '/Media/arrs_failed_stalled_recovery';
+    $base = LOG_DIR . '/Arrs_Stack/arrs_failed_stalled_recovery';
     $out  = ['last_run' => null, 'status' => null, 'fixed' => 0, 'searched' => 0];
 
     $jf = $base . '.json';