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.

Docker_Essentials/downloaders_reset.sh

@@ -602,11 +602,13 @@ if [[ -n "$QBIT_URL" ]] && [[ -n "$QBIT_USERNAME" ]]; then
             # Age check — must be old enough
             [[ "$AGE_DAYS" -lt "$QBIT_FAILSAFE_MIN_DAYS" ]] && ((SKIPPED++)) && continue
 
-            # Ratio check — if configured
+            # Ratio check — if configured. awk handles the fractional comparison;
+            # bash's [[ -lt ]] only does integers and would treat e.g. 1.4 and 1.5
+            # as equal once truncated. Missing/empty ratio defaults to 0 (protected).
             if [[ "$QBIT_FAILSAFE_MIN_RATIO" != "0" ]]; then
-                RATIO_INT="${RATIO%.*}"
-                MIN_RATIO_INT="${QBIT_FAILSAFE_MIN_RATIO%.*}"
-                [[ "$RATIO_INT" -lt "$MIN_RATIO_INT" ]] && ((SKIPPED++)) && continue
+                if (( $(awk "BEGIN {print (${RATIO:-0} < $QBIT_FAILSAFE_MIN_RATIO) ? 1 : 0}") )); then
+                    ((SKIPPED++)) && continue
+                fi
             fi
 
             if [[ "$DRY_RUN" == true ]]; then