Add read-only protocol fee bps method

[Chucks1093]

Summary

Add a dedicated read-only method for the protocol fee basis points value.

Acceptance Criteria

• method returns the stored protocol fee bps value
• method does not mutate contract state
• tests cover a successful protocol fee read

Contributor coordination: https://t.me/accesslayerorg

[devAgatha]

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

Hi maintainer. I can work on this issue, please assign.

Thank you!

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

[cypriannwokolo2-creator]

Can I be assigned these tasks please?

[cypriannwokolo2-creator]

I wish deliver very quickly

[drips-wave]

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

🧑‍💻 @devAgatha: 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.

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