List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-rules&page=5671
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "name": "Happy Go!!!",
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            "ended": "2025-08-17T17:18:52.389014Z",
            "start_waiting": "2025-04-13T04:00:14.884398Z",
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}