- Added `Money` value class for precise monetary operations.
- Implemented `BillingCalculator` to handle fee calculations, including ÖTO-compliant contributions and prize distribution rules.
- Created `BillingModule` for dependency injection using Koin.
- Integrated `billing-feature` into the desktop shell and project dependencies.
- Introduced `TurnierWizardV2` and `VeranstalterAuswahlV2` screens with improved UI and billing synchronization support.
Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>