Function order_to_hyperliquid_request_with_asset 

pub fn order_to_hyperliquid_request_with_asset(
    order: &OrderAny,
    asset: u32,
    price_decimals: u8,
    should_normalize_prices: bool,
    slippage_bps: u32,
) -> Result<HyperliquidExecPlaceOrderRequest>

Converts a Nautilus order to Hyperliquid request using a pre-resolved asset index.

This variant is used when the caller has already resolved the asset index from the instrument cache (e.g., for SPOT instruments where the index cannot be derived from the symbol alone). slippage_bps controls the buffer applied when deriving a limit from a stop trigger price.