[P1][frontend] Add a centralized API client

[dzekojohn4]

The frontend mixes fetch and Axios with inconsistent base URLs and error handling. Create one client with authentication, timeout, JSON/error normalization, and retry policy.

[oniololade60-coder]

@oniololade60-coder has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, I’ve reviewed the issue thoroughly and have a good understanding of what is required. I’m confident I can work on it effectively and deliver a solution that meets the expected criteria. I’d appreciate the opportunity to take it on.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @oniololade60-coder to this issue.

[Alimzy]

@Alimzy has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi! I'd like to work on this issue.

I'm a software engineer with hands-on experience in testing, debugging, and building reliable features across the stack. I'm confident I can take this on and deliver a solid, well-tested solution that follows the project's existing conventions.

I'll make sure to cover the core functionality as well as relevant edge cases to keep things reliable and regression-resistant.

Let me know if I can get started, and I'll provide updates as I progress.

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

[Enemuo-debug]

@Enemuo-debug has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Can I please be given the opportunity to work on this, I believe I have the skills necessary to perform the task

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

[Juwiix]

@Juwiix has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

can i work on this issue?

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

[drips-wave]

Congratulations, @Juwiix! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Juwiix: 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 🌊