Add integration test for creator feed empty filter set

[Chucks1093]

Summary
Add integration test for creator feed empty filter set

Scope

• add integration test for empty filter combinations on creator feed\n- assert stable response envelope and defaults\n- keep fixtures minimal and deterministic

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

[ONEONUORA]

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

Hi , I am a backend developer with 3 years of experience. I believe i can handle this issue

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

🧑‍💻 @ONEONUORA: 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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[drips-wave]

This issue has been completed by @ONEONUORA as part of the Stellar Wave Program's 4th Wave 🥳

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