Add creator feed filter combinator helper

[Chucks1093]

Summary
Add creator feed filter combinator helper

Scope

• add helper to compose creator-feed filters consistently\n- reduce duplicate combinator logic in feed handlers\n- keep filter semantics unchanged

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

[codewithzubair07]

@codewithzubair07 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I’d like to work on this issue. I have experience understanding existing codebases and delivering clean, efficient fixes.

GitHub: codewithzubair07

I can start immediately and provide a solid solution. Estimated time to resolve: 4 hours.

Assign this issue to me if available.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @codewithzubair07 to this issue.

[harystyleseze]

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

i would like to work on this

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

[numdinkushi]

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

Hi, I would like to work on this issue. Please assign me. Thank you

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

[drips-wave]

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

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

😎 @harystyleseze: 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. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.