- hasMore flag: compute from len(results) >= maxResults so the scheduler
knows more pages may exist, matching vacuum/EC handler pattern
- Exhausted server fallthrough: when no eligible volumes remain on the
current maxServer (all have pending tasks) or destination planning
fails, mark the server as exhausted and continue to the next
overloaded server instead of stopping the entire detection loop
- Return canonical destination server ID directly from createBalanceTask
instead of resolving via findServerIDByAddress, eliminating the
fragile address→ID lookup for adjustment tracking
- Fix bestScore sentinel: use math.Inf(-1) instead of -1.0 so disks
with negative scores (high pending load, same rack/DC) are still
selected as the best available destination
- Add TestDetection_ExhaustedServerFallsThrough covering the scenario
where the top server's volumes are all blocked by pre-existing tasks