Implement On-chain Protocol Fee Model

[Cedarich]

Introduce a small protocol fee on withdrawals or project funding to ensure long-term sustainability of the Lumenpulse platform. Complexity: Medium (150 points)

[Olamidepy]

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

Kindly assign me to this issue boss..

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

[drips-wave]

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

🧑‍💻 @Olamidepy: 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 @Olamidepy as part of the Stellar Wave Program's 4th Wave 🥳

Moderator's reason: [Auto-assessed] The contributor implemented the protocol fee model for both deposits and withdrawals, updated documentation, and added test coverage as requested. The PR has been open for over 24 hours with no maintainer objections, which qualifies it for approval under the program rules.

😎 @Olamidepy: You earned 200 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.