List backtest datasets

curl --request GET \
  --url https://api.quantdesk.app/api/v2/backtest/datasets

{
  "success": true,
  "data": [
    {
      "dataset_id": "sol-perp-1h-2025",
      "version": "1.2.0",
      "symbol": "SOL-PERP",
      "resolution": "1h"
    }
  ]
}