All backend endpoints accept subscription_id via Query(...) parameter,
but frontend was sending it in the request body via bodyWithSubId helper.
This caused multi-tariff operations (pause, autopay, renew, traffic,
devices, servers, tariff switch) to silently fail — backend couldn't
find subscription_id in query params and fell back to first subscription.
Changed bodyWithSubId to return [body, config] tuple with subscription_id
in params, spread into axios calls as separate arguments.
348d654892