* Fix remote.meta.sync TTL issue (#8021)
Remote entries should not have TTL applied because they represent files
in remote storage, not local SeaweedFS files. When TTL was configured on
a prefix, remote.meta.sync would create entries that immediately expired,
causing them to be deleted and recreated on each sync.
Changes:
- Set TtlSec=0 explicitly when creating remote entries in remote.meta.sync
- Skip TTL application in CreateEntry handler for entries with Remote field set
Fixes#8021
* Add TTL protection for remote entries in update path
- Set TtlSec=0 in doSaveRemoteEntry before calling UpdateEntry
- Add server-side TTL protection in UpdateEntry handler for remote entries
- Ensures remote entries don't inherit or preserve TTL when updated
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