* fix(s3): use recursive delete for .versions directory cleanup
When only delete markers remain in a .versions directory,
updateLatestVersionAfterDeletion tried to delete it non-recursively,
which failed with "fail to delete non-empty folder" because the delete
marker entries were still present. Use recursive deletion so the
directory and its remaining delete marker entries are cleaned up together.
* fix(s3): guard .versions directory deletion against truncated listings
When the version listing is truncated (>1000 entries), content versions
may exist beyond the first page. Skip the recursive directory deletion
in this case to prevent data loss.
* fix(s3): preserve delete markers in .versions directory
Delete markers must be preserved per S3 semantics — they are only
removed by an explicit DELETE with versionId. The previous fix would
recursively delete the entire .versions directory (including delete
markers) when no content versions were found.
Now the logic distinguishes three cases:
1. Content versions exist → update latest version metadata
2. Only delete markers remain (or listing truncated) → keep directory
3. Truly empty → safe to delete directory (non-recursive)
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