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.

Watchdogs/System/network_watchdog.sh

@@ -125,16 +125,9 @@ log "$ICON_NET   DDNS: ${DDNS_DOMAIN:-not configured} → ${DDNS_CONTAINER:-no c
 
 touch "${NETWORK_WATCHDOG_NPM_STATE_FILE}" 2>/dev/null
 
-# ━━━ Strike helpers ━━━
-get_strikes() { grep "^${1}:" "${2}" 2>/dev/null | cut -d: -f2 || echo "0"; }
-set_strikes() {
-    local key="$1" count="$2" file="$3"
-    if grep -q "^${key}:" "$file" 2>/dev/null; then
-        sed -i "s|^${key}:.*|${key}:${count}|" "$file"
-    else
-        echo "${key}:${count}" >> "$file"
-    fi
-}
+# ━━━ Strike helpers — wrap common.sh's wd_state_get()/wd_state_set() ━━━
+get_strikes() { wd_state_get "$1" "$2"; }
+set_strikes() { wd_state_set "$1" "$2" "$3"; }
 
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