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af09e1ec7e
When an earlier EC encoding succeeded but the post-encode source-delete left a regular replica behind on one of the servers, the next detection cycle proposes the same volume again. The new encode tries to redistribute shards to targets that already have them mounted, the volume server returns `ec volume %d is mounted; refusing overwrite`, the task fails, and detection re-queues the volume. The cycle repeats forever — issue #9448. The existing `metric.IsECVolume` skip catches the case where the canonical metric is reported on the EC-shard side of the heartbeat, but when the master sees BOTH a regular replica AND its EC shards in the same volume list, the canonical metric we pick is the regular replica and IsECVolume is false. Add a second guard that checks the topology directly via `findExistingECShards` (already present and indexed) and skip the volume when any shards exist, logging a warning that points the admin at the stuck source. This breaks the loop. Auto-cleanup of the orphaned replica is left as follow-up work — deleting a source replica from inside the detector is only safe with a re-verification step right before the delete, plus a config opt-in, and is best done in its own change.