helm: add optional parameters to COSI BucketClass (#8453)

Add cosi.bucketClassParameters to allow passing arbitrary parameters
to the default BucketClass resource. This enables use cases like
tiered storage where a diskType parameter needs to be set on the
BucketClass to route objects to specific volume servers.

When bucketClassParameters is empty (default), the BucketClass is
rendered without a parameters block, preserving backward compatibility.

Signed-off-by: Kirill Ilin <stitch14@yandex.ru>
Co-authored-by: Claude <noreply@anthropic.com>

k8s/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml

@@ -6,6 +6,10 @@ metadata:
   name: {{ .Values.cosi.bucketClassName }}
 driverName: {{ .Values.cosi.driverName }}
 deletionPolicy: Delete
+{{- with .Values.cosi.bucketClassParameters }}
+parameters:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
 ---
 kind: BucketAccessClass
 apiVersion: objectstorage.k8s.io/v1alpha1