Add pagination Link headers for list endpoints

[Chucks1093]

Summary
Add pagination Link headers for list endpoints

Scope

• emit RFC-compatible Link headers for paginated endpoints\n- include next/prev where applicable\n- keep existing response body pagination metadata

Acceptance Criteria

• scoped change is implemented with no unrelated file churn
• docs/tests are updated where applicable
• contributor can validate the outcome locally

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[AbuJulaybeeb]

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

Hi Maintainer,
I would like to work on this issue

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

[drips-wave]

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

🧑‍💻 @AbuJulaybeeb: 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

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🌊 Happy Wave 🌊

[drips-wave]

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

Moderator's reason: [Auto-assessed] The PR was created by the assigned contributor more than 24 hours ago and directly addresses the issue by implementing RFC-compatible Link headers for pagination. The code changes are focused and align with the acceptance criteria, and there are no objections from maintainers.

😎 @AbuJulaybeeb: 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.