This commit enhances the tournament management system by introducing functionality for handling external participants and tournament classes. New methods are added to the `tournamentController` and `tournamentService` for adding, retrieving, updating, and removing external participants, as well as managing tournament classes. The backend models are updated to support these features, including new relationships and attributes. The frontend is also updated to allow users to manage external participants and classes, improving the overall user experience and interactivity in tournament management.
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