Add creator list field picker helper

[Chucks1093]

Summary

Add a small helper to control which creator fields are included in public list responses.

Acceptance Criteria

• helper centralizes allowed list fields
• public list responses can reuse the helper consistently
• helper keeps response shaping behavior explicit

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

[K1NGD4VID]

@K1NGD4VID has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I should take on this task because I have strong experience designing clean backend abstractions and can implement a reusable helper that centralizes and enforces allowed creator list fields.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @K1NGD4VID to this issue.

[drips-wave]

Congratulations, @K1NGD4VID! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @K1NGD4VID: 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 @K1NGD4VID as part of the Stellar Wave Program's 3rd Wave 🥳

Moderator's reason: [Auto-assessed] PR #70 directly addresses the requirements of issue #65 by centralizing creator list fields using a Prisma select object and updating the relevant services and serializers. The PR has been open for over 24 hours without any maintainer objections, and the implementation is clean and follows the acceptance criteria.

😎 @K1NGD4VID: 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.