Remove all modem purchase/management code:
- Delete modem handler, service, and tests
- Remove modem button from keyboards and admin panel
- Remove modem pricing from calculations
- Remove modem REST API endpoint and schemas
- Remove modem decorator, config settings, and notification formatting
- Keep DB column and migration for backwards compatibility
- Add pyproject.toml with uv and ruff configuration
- Pin Python version to 3.13 via .python-version
- Add Makefile commands: lint, format, fix
- Apply ruff formatting to entire codebase
- Remove unused imports (base64 in yookassa/simple_subscription)
- Update .gitignore for new config files
Рефакторинг архитектуры управления модемом:
- Создан сервис app/services/modem_service.py:
- ModemService с бизнес-логикой подключения/отключения
- ModemError enum для типизации ошибок
- ModemPriceInfo, ModemOperationResult dataclass'ы
- Константы MODEM_WARNING_DAYS_* для уровней предупреждений
Fringg