TickerAll: Bulk operations: act on multiple accounts or orders in one request

Add batch endpoints so a single API call can act across several accounts or several orders at once — for example, read the state of all your connected accounts together, or place, modify, or close a group of orders in one request — instead of making one call at a time. This cuts round-trips and makes running a larger pool of accounts simpler and faster. If this would help you, tell us which operations you'd most want batched — reads, placing orders, closing or modifying positions, or connecting and disconnecting accounts — so we can prioritise the ones people actually need.