- **Database Changes:** Introduced `turnier_nummer` (mandatory, 5 digits) and `einschraenkungen` (mandatory, ÖTO-specific constraints) columns in `turniere` table. Seeded `turnier_nummer` with `oeps_turniernummer` where applicable.
- **Domain Models:** Extended `Turnier` and `DomTurnier` with `turnierNummer` and `einschraenkungen` fields. Added `TeilnehmerKreisE` enum for mapping restriction types.
- **Services and Controllers:** Updated repository and service operations to handle the new fields. Controllers reflect the new request models for creation and updates.
- **Validation:** Enforced input validation for `turnierNummer` format and `einschraenkungen` values.
Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>