GET /leaderboard/volume: Polymarket Volume Leaderboard

curl -G https://bravado-api-k7kaq.ondigitalocean.app/leaderboard/volume \
  -H "Authorization: Bearer <token>" \
  -d window=30d

{
  "mode": "volume",
  "window": "30d",
  "results": [
    {
      "rank": 1,
      "trader": "0xdef789...abc012",
      "username": "volumeking",
      "volume_usdc": "2145000.000000",
      "trades": 4820
    }
  ]
}