fix: [0km] improve backup check detection

bin/0km

@@ -259,7 +259,7 @@ vps_check() {
     fi </dev/null
     compose_content=$(ssh:run "root@$vps" -- cat /opt/apps/myc-deploy/compose.yml </dev/null) ||
         { echo "${DARKRED}no-compose${NORMAL}"; return 1; }
-    echo "$compose_content" | grep backup >/dev/null 2>&1 ||
+    echo "$compose_content" | yq -e ".rsync-backup" >/dev/null 2>&1 ||
         { echo "${DARKRED}no-backup${NORMAL}"; return 1; }
 }