List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=players_start&page=4560
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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                "name": "Atlanta Go Club",
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                "username": "wiadp1",
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            "ended": "2025-08-24T15:47:36.755639Z",
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}