- Add revoke handler for classic and multi-tariff modes with 2-step
confirmation dialog and TOCTOU-safe cooldown enforcement
- Add cabinet API endpoint POST /subscription/revoke with 429 + Retry-After
for cooldown, IDOR protection via resolve_subscription
- Add last_revoke_at column to subscriptions (Alembic migration 0071)
- Add SUBSCRIPTION_REVOKE_ENABLED and COOLDOWN_SECONDS config settings
- Add revoke button to classic subscription settings keyboard and
multi-tariff detail keyboard (gated by feature toggle)
- Add locale keys for revoke UI in all 5 languages (ru, en, ua, zh, fa)
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