Fix dead/incorrect vars and consolidate duplicated logic into common.sh

Codebase-wide audit pass: fixed real bugs (SSH hangs missing BatchMode,
local-outside-function no-ops, variable name collisions, a truncated
ratio calc, wrong state-dir path, DARK vs NO_INTERNET drift, and more),
then pulled logic that was duplicated across multiple scripts — arr
cleanup safety gates, docker restart ordering, container maintenance
stop/restart, watchdog state-file helpers, partnership role resolution,
cert expiry checks, remote node discovery, and TMDB discovery scoring —
into common.sh so each now has a single implementation.

Arrs_Stack/lidarr_release_fixer.sh

@@ -283,17 +283,6 @@ read_file_mbid() {
     esac
 }
 
-translate_container_path() {
-    local cpath="$1"
-    for cp in "${!ARR_PATH_MAP[@]}"; do
-        if [[ "$cpath" == "${cp}"* ]]; then
-            echo "${ARR_PATH_MAP[$cp]}${cpath#$cp}"
-            return
-        fi
-    done
-    echo "$cpath"
-}
-
 # ── Safety checks ─────────────────────────────────────────────────────────────────────────────
 echo ""
 echo "━━━ $ICON_SHIELD Safety Checks ━━━"
@@ -322,7 +311,7 @@ while IFS= read -r artist; do
     aid=$(echo "$artist" | jq -r '.id')
     apath=$(echo "$artist" | jq -r '.path // empty')
     aname=$(echo "$artist" | jq -r '.artistName // empty')
-    [[ -n "$apath" ]] && ARTIST_PATH_CACHE[$aid]=$(translate_container_path "$apath")
+    [[ -n "$apath" ]] && ARTIST_PATH_CACHE[$aid]=$(translate_path "$apath")
     [[ -n "$aname" ]] && ARTIST_NAME_CACHE[$aid]="$aname"
 done < <(echo "$ALL_ARTISTS" | jq -c '.[]' 2>/dev/null)
 unset ALL_ARTISTS