s3: read bucket owner and crtime from the entry-free bucket config

The owner index read the raw filer entry off BucketConfig, which no
longer carries one. Cache Crtime alongside IdentityId, and pass the
owner id rather than the entry through the ListBuckets visibility
checks so the scan and granted-bucket paths share one implementation.

weed/s3api/s3api_bucket_config.go

@@ -38,6 +38,7 @@ type BucketConfig struct {
 	ACL              []byte
 	Owner            string
 	IdentityId       string // identity that created the bucket
+	Crtime           int64  // bucket creation time, unix seconds
 	IsPublicRead     bool   // Cached flag to avoid JSON parsing on every request
 	CORS             *cors.CORSConfiguration
 	ObjectLockConfig *ObjectLockConfiguration      // Cached parsed Object Lock configuration
@@ -404,6 +405,10 @@ func (s3a *S3ApiServer) newBucketConfigFromEntry(bucket string, entry *filer_pb.
 		return config
 	}
 
+	if entry.Attributes != nil {
+		config.Crtime = entry.Attributes.Crtime
+	}
+
 	if entry.Extended != nil {
 		if versioning, exists := entry.Extended[s3_constants.ExtVersioningKey]; exists {
 			config.Versioning = string(versioning)