[Frontend] Implement Admin Real-time Metrics Dashboard

[Solomonsolomonsolomon]

Create an admin widget displaying live active user counts and server health by querying GET /realtime/stats.

[Favourof]

@Favourof has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I will love to work on this issue.

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

[drips-wave]

Congratulations, @Favourof! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Favourof: 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 🌊

[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @Favourof as part of the Stellar Wave Program's 5th Wave 🥳

Moderator's reason: [Auto-assessed] The contributor successfully implemented the admin real-time metrics dashboard by adding the necessary API service, UI components, and polling logic. Although there were previous merge conflicts, the contributor has resolved them, and the PR is now in a mergeable state with no outstanding maintainer objections.

😎 @Favourof: You earned 100 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.

ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.