- Add `ApiRoutes` for central backend routing configuration.
- Implement `DefaultVeranstalterRepository` and `DefaultTurnierRepository` with Ktor clients.
- Add domain models (`Turnier`, `Bewerb`, `Abteilung`, `Veranstalter`) and respective repository interfaces.
- Replace fake VeranstalterRepository with real implementation.
- Update DI with `veranstalterModule` and HTTP client injection.
- Simplify TokenProvider and update HttpClient setup (timeouts, retries, logging).
- Mark roadmap tasks B-2 as partially complete.