Contract: Implement gasless approvals for batching

[Ceejaytech25]

Implement a signature-based verification system that allows a relayer to submit token approvals on behalf of a user, facilitating gasless onboarding.

[wokedi]

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

Hello maintainer,I have reviewed the task description, please assign me this issue. Thank you

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[drips-wave]

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

🧑‍💻 @wokedi: 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.

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🌊 Happy Wave 🌊

[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @wokedi as part of the Stellar Wave Program's 4th Wave 🥳

Moderator's reason: [Auto-assessed] The contributor has implemented a comprehensive gasless relayer system for token approvals in PR #304 (ceejaylaboratory/AnchorPoint), including detailed documentation, unit tests, and the necessary API infrastructure. Although the PR body focuses on migration verification, the code changes effectively address the requirements of issue #272.

😎 @wokedi: 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.