feat: add admin content moderation queue (flag inappropriate comments)

[Anuoluwapo25]

Action:\n- [ ] Add Flag button on comments\n- [ ] Add flagged_content table (content_type, content_id, reporter, reason)\n- [ ] Admin sees flagged content queue at /api/admin/moderation\n- [ ] Admin can: delete content, dismiss flag, warn user\n- [ ] Auto-hide content with 3+ flags pending admin review\n- [ ] Email admin on new flag

[pugsley76]

@pugsley76 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I’d like to work on this issue as a senior developer. I have strong experience and can solve the issue above if given

ℹ️ Repo Maintainers: To accept this application, review their application or assign @pugsley76 to this issue.

[drips-wave]

Congratulations, @pugsley76! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @pugsley76: 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 🌊