Get withdraw operation status

GET /v1/wallet/withdrawals/{operationId}

Durable status lookup for a withdraw operation. Returns the latest known {operationId, txHash?, status, broadcastAt, confirmedAt?, failedReason?, settlement} from the local withdraw_operations table. Lets the UI reconnect to an in-flight withdraw after the modal closes. When settlement is exchange_ledger (Lighter), the withdraw carries no chain transaction at submit time and this endpoint is the progress source — it resolves the operation against the venue's own withdraw ledger on read.