Add integration test for creator list with negative page size param

[Chucks1093]

Summary
Sending a negative page size value is an invalid input that should be rejected cleanly. An integration test for this case confirms the server returns a consistent validation error rather than an unexpected result or 500.

Scope

• add an integration test that sends the creator list endpoint with a negative page size param
• assert the response returns a 400 with the expected error shape
• assert no database query is issued for the invalid input

Acceptance Criteria

• a negative page size param returns a 400 response
• the error body matches the standard validation error shape
• the test is distinct from the max page size boundary test

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

[ayinde38]

@ayinde38 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

will love to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ayinde38 to this issue.

[drips-wave]

Congratulations, @ayinde38! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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