List all wallets for an account

curl --request GET \
  --url https://api.bluumfinance.com/v1/accounts/{account_id}/wallets \
  --header 'Authorization: Basic <encoded-value>'

{
  "wallets": [
    {
      "wallet_id": "w_a1b2c3d4e5f6",
      "currency": "USD",
      "balance": "1500.00",
      "available_balance": "1200.00",
      "reserved_balance": "300.00",
      "status": "active",
      "created_at": "2025-01-15T10:30:00Z"
    },
    {
      "wallet_id": "w_b2c3d4e5f6g7",
      "currency": "EUR",
      "balance": "500.00",
      "available_balance": "500.00",
      "reserved_balance": "0.00",
      "status": "active",
      "created_at": "2025-01-20T14:00:00Z"
    }
  ]
}