Current open orders for a wallet on Hyperliquid

HL Info `frontendOpenOrders` — the UI-enriched open-order list (coin, side, limitPx, sz, orderType, reduceOnly, trigger, timestamp) in `native`. Public — no auth, `?user=` lowercased server-side, the wallet need not belong to the caller org. Served from the self-hosted node (no HL rate-limit cost) and short-TTL cached. Pass `?dex=` for a HIP-3 / builder dex order book (e.g. `xyz`) — the two universes are separate books, so a wallet's HIP-3 resting orders (incl. TP/SL triggers) only appear WITH `dex`; omit for the main perp (same semantics as `clearinghouse-state`). NOTE: these are resting (placed) orders; for what executed use `info/historical-orders` (order lifecycle) or `/v1/me/fills` (trade fills).