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/Watchdogs/System/webgui_watchdog.sh

@@ -123,7 +123,7 @@ if [[ "$SHOW_STATUS" == true ]]; then
     echo "━━━━━ $ICON_SUMMARY WEBGUI WATCHDOG STATUS ━━━━━"
     echo "$ICON_HOST    Identity:    $MY_ID ($LOCAL_SERVER_NAME)"
     echo "$ICON_WEBGUI  URL:         $WEBGUI_URL"
-    echo "$ICON_WEBGUI  Timeouts:    curl=${WEBGUI_TIMEOUT}s nginx=${WEBGUI_NGINX_WAIT}s php=${WEBGUI_PHP_WAIT:-10}s emhttp=${WEBGUI_EMHTTP_WAIT}s"
+    echo "$ICON_WEBGUI  Timeouts:    curl=${WEBGUI_TIMEOUT}s nginx=${WEBGUI_NGINX_WAIT}s php=${WEBGUI_PHP_WAIT}s emhttp=${WEBGUI_EMHTTP_WAIT}s"
     echo ""
 
     if curl -sf --max-time "$WEBGUI_TIMEOUT" "$WEBGUI_URL" >/dev/null 2>&1; then
@@ -227,8 +227,8 @@ if [[ "$RECOVERY_OK" == false ]]; then
             error "php-fpm restart command failed"
         fi
 
-        log "Waiting ${WEBGUI_PHP_WAIT:-10}s for php-fpm to recover..."
-        sleep "${WEBGUI_PHP_WAIT:-10}"
+        log "Waiting ${WEBGUI_PHP_WAIT}s for php-fpm to recover..."
+        sleep "$WEBGUI_PHP_WAIT"
 
         if check_webgui; then
             RECOVERY_ACTION="php-fpm restart"