Add integration test for creator route with malformed wallet address param

[aniokedianne]

Summary
The creator route param validation middleware exists, but there is no integration test that sends a malformed wallet address and asserts the correct rejection response. A test for this path confirms the middleware is wired up and returns the right status and error shape.

Scope

• add an integration test that sends a creator route request with a malformed wallet address param
• assert the response is a 400 with the expected error shape
• test at least two malformed variants such as wrong length and invalid characters

Acceptance Criteria

• a malformed wallet address param returns a 400 response
• the error body matches the standard error shape
• a valid wallet address param is unaffected

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

[MerlinTheWhiz]

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

Hi, can I work on this?

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[Danielodingz]

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

Hey maintainer, please i would like to work on this issue.

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[ritik4ever]

@ritik4ever has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi
I’d like to work on this issue if it’s available. I’m a full-stack Web2 & Web3 developer with solid open-source experience and can start working on it right away.

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