Fix s3 versioning listing bugs (#7705)

* fix: add pagination to list-object-versions for buckets with >1000 objects

The findVersionsRecursively() function used a fixed limit of 1000 entries
without pagination. This caused objects beyond the first 1000 entries
(sorted alphabetically) to never appear in list-object-versions responses.

Changes:
- Add pagination loop using filer.PaginationSize (1024)
- Use isLast flag from s3a.list() to detect end of pagination
- Track startFrom marker for each page

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: prevent infinite loop in ListObjects when processing .versions directories

The doListFilerEntries() function processes .versions directories in a
secondary loop after the main entry loop, but failed to update nextMarker.
This caused infinite pagination loops when results were truncated, as the
same .versions directories would be reprocessed on each page.

Bug introduced by: c196d03951
("fix listing object versions (#7006)")

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

weed/s3api/s3api_object_handlers_list.go

@@ -573,6 +573,10 @@ func (s3a *S3ApiServer) doListFilerEntries(client filer_pb.SeaweedFilerClient, d
 			break
 		}
 
+		// Update nextMarker to ensure pagination advances past this .versions directory
+		// This is critical to prevent infinite loops when results are truncated
+		nextMarker = versionsDir
+
 		// Extract object name from .versions directory name (remove .versions suffix)
 		baseObjectName := strings.TrimSuffix(versionsDir, s3_constants.VersionsFolder)