s3api: fix ListObjectVersions inconsistency with delimiters (#8210)

* s3api: fix ListObjectVersions inconsistency with delimiters (fixes #8206)

Prioritize handling of .versions and .uploads directories before
delimiter processing in collectVersions. This ensures .versions
directories are processed as version containers instead of being
incorrectly rolled up into CommonPrefixes when a delimiter is used.

* s3api: refactor processDirectory to remove redundant special directory checks

These checks are now handled in the main collectVersions loop.

weed/s3api/s3api_object_versioning.go

@@ -640,6 +640,24 @@ func (vc *versionCollector) collectVersions(currentPath, relativePath string) er
 				continue
 			}
 
+			// Handle special directories that should bypass delimiter logic
+			// This ensures .versions directories are processed as version containers
+			// rather than being rolled up into CommonPrefixes when a delimiter is used
+			if entry.IsDirectory {
+				// Skip .uploads directory
+				if strings.HasPrefix(entry.Name, s3_constants.MultipartUploadsFolder) {
+					continue
+				}
+
+				// Handle .versions directory
+				if strings.HasSuffix(entry.Name, s3_constants.VersionsFolder) {
+					if err := vc.processVersionsDirectory(entryPath); err != nil {
+						return err
+					}
+					continue
+				}
+			}
+
 			// Group into common prefixes if delimiter is found after the prefix
 			if vc.delimiter != "" {
 				fullKey := entryPath
@@ -688,16 +706,6 @@ func (vc *versionCollector) collectVersions(currentPath, relativePath string) er
 
 // processDirectory handles directory entries
 func (vc *versionCollector) processDirectory(currentPath, entryPath string, entry *filer_pb.Entry) error {
-	// Skip .uploads directory
-	if strings.HasPrefix(entry.Name, ".uploads") {
-		return nil
-	}
-
-	// Handle .versions directory
-	if strings.HasSuffix(entry.Name, s3_constants.VersionsFolder) {
-		return vc.processVersionsDirectory(entryPath)
-	}
-
 	// Handle explicit S3 directory object
 	if entry.Attributes.Mime == s3_constants.FolderMimeType {
 		vc.processExplicitDirectory(entryPath, entry)