List Importable Order Books

curl -X GET "https://api.trusset.org/orderbooks/stocks/api/order-books/importable" \
  -H "x-api-key: trusset_{instanceRef}_{secret}"

{
  "success": true,
  "data": [
    {
      "id": "ob_ext456",
      "name": "ACME Corp Shares / EURC",
      "symbol": "ACME/EURC",
      "status": "ACTIVE",
      "settlementMode": "ON_CHAIN"
    }
  ],
  "metadata": {
    "requestId": "550e8400-e29b-41d4-a716-446655440000",
    "timestamp": "2025-01-15T10:30:00.000Z",
    "instanceId": "inst_abc"
  }
}