- Added `ReiterSparteTable` to manage rider-discipline associations.
- Introduced services and tests for `LicenseMatrix`, `Altersklasse`, and `AbteilungsRegel` with domain logic and validations for ÖTO compliance.
- Enhanced `ExposedReiterRepository` to save and query `Reiter` disciplines efficiently.
- Implemented database migration script `V007__Cleanup_Initial_Tables_and_Add_Sparte.sql`.
- Updated `MasterdataDatabaseConfiguration` to include `ReiterSparteTable` in the schema initialization.
- Expanded test coverage with new cases for eligibility checks, age group determinations, and splitting regulations.
Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>