Add detection for migration in progress scenarios based on vhost:
- Classic queues in / AND quorum queues in /openstack
- Classic queues in / AND quorum queues in / (legacy mixed setup)

This improves detection accuracy when migration is partially complete
or when a mixed classic/quorum setup was used previously.

AI-assisted: Claude Code

Signed-off-by: Christian Berendt <berendt@osism.tech>