Add integration test for webhook registration returning 401 when wallet signature is invalid

[Chucks1093]

Summary

Registering a trade webhook requires wallet signature verification. An integration test should confirm that a request with a missing or invalid signature is rejected with 401 before the webhook record is created.

Scope

• POST to /creators/:id/webhooks with no signature header and assert 401
• POST with a signature signed by a different wallet and assert 401
• Assert no webhook record exists in the database after either failed attempt

Acceptance Criteria

• Missing signature header returns 401
• Wrong wallet signature returns 401
• No webhook record created after failed auth

ETA: 12 hours

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Coordinate on Telegram

[BigJohn-dev]

@BigJohn-dev has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Allow me fix this ASAP

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[NEA-DEV-coder]

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Hi maintainer, I will like to resolve this issue if assigned. Thank you

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[Georgechisom]

@Georgechisom has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, i have reviewed this serve issue and i have got the experience and skill to solve it, kindly assign it to me

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[Oluwasuyi-Timilehin]

@Oluwasuyi-Timilehin has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, please assign this to me. I would get started immediately

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