Community: Invitation to Private Groups

This update delivers end-to-end functionality for private groups, covering creation, access management, and secure invitation workflows. On the client side, it includes group creation, invite link generation with expiry, validation, joining via links, and access management with full audit and logging. In addition to that it introduces support for hidden groups, whitelist management, and personal invitation links. Together, these features ensure private groups are secure, controlled, and user-friendly.