List live streams: orderBy fix and simulcast targets in the response

Two fixes have shipped for the list live streams endpoint.

• orderBy (alongside limit and offset) was already supported on the endpoint, but orderBy had a bug that produced incorrect ordering in certain cases. Sorting now returns results in the expected order.
• The list response previously did not include simulcast targets for streams that had them configured. The response now includes the simulcastTargets for each live stream, so you can render the full multi-destination configuration without making a follow-up call per stream.

These are backwards-compatible fixes — existing clients keep working — but if you build dashboards or admin UIs over live streams, you should now see the correct ordering and the simulcast configuration directly in the list payload.