feat: integrate Antilopay payment provider (API v2)
- Add antilopay_service.py with SHA256WithRSA signing (pycryptodome),
private key for requests, public key for callback verification
- Add payment mixin with create/callback/finalize/check_status flows,
kopeks↔rubles conversion, 7 status mappings, prefer_methods support
- Add CRUD with FOR UPDATE locking, idempotency checks
- Add handlers with SBP/Card/SberPay sub-method selection
- Add Alembic migration for antilopay_payments table
- Add config (ANTILOPAY_ENABLED, SECRET_ID, PRIVATE_KEY, PUBLIC_KEY,
PROJECT_ID, SBP/CARD/SBERPAY enabled/display names)
- Add webhook endpoint with X-Apay-Callback header signature verification
- Register in keyboard, router, utils, backup, method config
Fringg
719664208e