- Added `PferdReiterEingabe` for horse and rider selection with search functionality and keyboard navigation.
- Implemented `NennungenTabelle` to display filtered registrations based on selected horse or rider.
- Introduced `NennungsMaske` to combine search, table, and competition views for streamlined user interaction.
- Extended types with `Veranstalter` interface and mock data for better context and integration.
- Documented ÖTO-compliant tournament structure for frontend reference.
Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>
