replace `extra_urls` with `get_urls` in `SchonAdminSite` for improved URL handling and compatibility with super-class methods. Simplify `apps.py` to set `SchonAdminSite` directly as the class of `admin.site`.
- Refactored monetary fields across models to use `DecimalField` for improved precision.
- Implemented two-factor authentication (2FA) for admin logins with OTP codes.
- Added ability to generate admin OTP via management commands.
- Updated Docker Compose override for dev-specific port bindings.
- Included template for 2FA OTP verification to enhance security.
Additional changes:
- Upgraded and downgraded various dependencies (e.g., django-celery-beat and yarl).
- Replaced float-based calculations with decimal for consistent rounding behavior.
- Improved admin user management commands for activation and OTP generation.
