Feature Request: Invite System for User Registration

Description:

I’d like to propose adding an invite-based registration system to Node Solid Server (NSS). This would be especially useful for small instances with limited resources, allowing admins to manage their user base more efficiently.

Why This Matters

• Resource Management: Small instances often have limited bandwidth, storage, or processing power. An invite system helps control user growth to match available resources.
• Spam Prevention: Open registration can attract spam accounts, which can be costly to moderate. An invite system ensures that new users are vetted.
• Community Building: Some deployments may prefer a curated user base, inviting only trusted individuals to maintain a specific ecosystem.

Proposed Implementation

• Admins can generate invite codes via a command-line tool or admin panel.
• Option to set invite limits (e.g., single-use, multi-use, or time-limited).
• Invite-based signups would work alongside existing registration methods (configurable in settings).

Would love to hear thoughts on feasibility and whether others would find this useful. Let me know if there’s interest, and I’d be happy to explore potential approaches!

No files, tests, or entry points are named. Start by locating the existing registration flow and configuration, then determine how an admin panel or command-line tool could generate single-use, multi-use, or time-limited invites alongside current registration methods. Done means the scope and configuration behavior are defined and covered by appropriate tests.