Make toram default and add install-to-ram CLI

iso/overlay/usr/local/bin/bee-remount-medium

@@ -28,6 +28,10 @@ done
 log() { echo "[$(date +%H:%M:%S)] $*"; }
 die() { log "ERROR: $*" >&2; exit 1; }
 
+if [ "$(id -u)" -ne 0 ]; then
+    die "bee-remount-medium must be run as root (use sudo or a root shell)"
+fi
+
 # Return all candidate block devices (optical + removable USB mass storage)
 find_candidates() {
     # CD/DVD drives