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.

load_config.sh

@@ -135,7 +135,8 @@
     CONF_DIR="${SCRIPTS_DIR}/Configurations"
     LOG_DIR="/var/log/varaverk"
     VV_CACHE_DIR="/tmp/vv_cache"
-    export CONF_DIR LOG_DIR VV_CACHE_DIR
+    CONF_RAM_CACHE_DIR="/tmp/.cache/vv/d"   # tmpfs — cleared every reboot, repopulated by conf_sync.sh
+    export CONF_DIR LOG_DIR VV_CACHE_DIR CONF_RAM_CACHE_DIR
 
 # ━━━ Cleanup ━━━
     unset _conf _host_confs_loaded _adapter LOAD_CONFIG_DIR