Add admin queue assignment

[Naomi-Gift]

Problem

Verification and moderation requests are not assignable. Multiple admins could duplicate work or miss pending items.

Suggested fix

Add assignment state for admin queues and filters for assigned/unassigned items.

Acceptance criteria

• Admins can assign requests to themselves or another admin.
• Queue filters include assigned to me and unassigned.
• Assignment changes are audit logged.

[azahjessica49-commits]

@azahjessica49-commits has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I'd like to work on this issue because adding admin queue assignment improves operational efficiency by enabling tasks or requests to be routed to the appropriate administrators. It's a valuable backend feature that enhances workflow management, accountability, and scalability as the application grows.
I have experience working with backend systems, database design, and role-based access control.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @azahjessica49-commits to this issue.

[drips-wave]

Congratulations, @azahjessica49-commits! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @azahjessica49-commits: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊