feat: Update `query_accessible_vfolders()` to include shared-by/shared-with flags in the result

[agatha197]

Is your feature request related to a problem? Please describe. Users cannot easily distinguish between private folders, folders shared by me, or folders shared by others.

Describe the solution you'd like Update query_accessible_vfolders() to include shared-by/shared-with flags in the result and apply them to the virtual folder's query filter.

Additional context

• If there is a row with a vfolder_id whose id matches in the vfolder_permissions table, the shared_by_me is true.
• If there is a row with a user_id in the vfolder_permissions table that matches the person who requests user_id, you can reversely refer to the vfolder table to get the shared_with_me information.