Admin tooling for local->object Primary Storage migrations

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Is your feature request related to a problem?

Migrating a Nextcloud instance from local Primary Storage to Object Storage currently requires an out-of-band data migration and may result in the loss of metadata such as ownership and sharing information.

Describe the solution you'd like

Provide an administrative mechanism to migrate local Primary Storage to Object Storage while preserving file metadata, ownership, shares, and other configuration.

Describe alternatives you've considered

• External Storage does not provide equivalent Primary Storage functionality.
• DAV and user-to-user transfers are not scalable and may not preserve sharing information.
• Out-of-band migration requires accepting metadata loss.

Additional context

This would address an important gap for deployments transitioning to Object Storage and could potentially build on existing multi-bucket or multi-instance Primary Storage functionality.

Start by reviewing the existing multi-bucket or multi-instance Primary Storage functionality mentioned in the issue, along with how local and Object Storage are currently configured. Define the migration scope and preservation requirements for metadata, ownership, shares, and other configuration; the work is done when an administrative migration path satisfies those requirements.