- handle_successful_payment: after status, reset FSM to lobby and send main
menu keyboard (state injected by dispatcher)
- confirm_development_payment (dev path): same — edit status then reply with
main menu; add state param
- tests: assert second message carries main-menu markup; _StubState clear/set_state
- subscription_time_left: replace floor-div '23 ч.'/'мин.' branches with the
concrete expiry timestamp when less than a full day remains
- add MSK_TIMEZONE (UTC+3) as display default; label time as '(МСК)'
- add shared subscription_status_text helper, use it in status menu,
post-payment reply and dev confirmation instead of floor-rounded days
- tests: cover under-a-day clock format; fix stale to_thread mock
- payments.py: sendInvoice (XTR, 100 звёзд) -> pre_checkout_query -> successful_payment
- /subscribe больше не активирует подписку сам — только отправляет счёт
- handle_pre_checkout подтверждает только свой payload в XTR на 100 звёзд
- таблица payments по telegram_payment_charge_id защищает от двойного начисления
- 16 новых тестов платежей, старый тест заглушки переписан; 75 тестов OK
- Dockerfile копирует payments.py, VERSION 0.1.0+25
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