Add helper for building a test HTTP request with all required auth headers pre-populated

[Chucks1093]

Summary

Integration tests that hit auth-protected endpoints need to attach a valid wallet signature header on every request. Building these headers manually in each test is repetitive. A shared test request builder should handle auth header construction so tests focus on the scenario being tested.

Scope

• Add buildAuthRequest(method, path, body, walletKeypair) test helper
• Signs the request body with the provided keypair and attaches the X-Wallet-Signature header
• Returns a pre-configured request object ready for the test HTTP client
• Add a unit test confirming the generated header passes the signature verification middleware

Acceptance Criteria

• Helper attaches correct signature header
• Generated request passes signature verification middleware
• Works for POST and DELETE methods

ETA: 12 hours

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Coordinate on Telegram

[AnnieIj]

Hi maintainer; i will like to work on this issue. Thanks

[Adesam007-pr3dator]

@Adesam007-pr3dator has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I would love to work on this issue

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[chiscookeke11]

@chiscookeke11 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi
let me take care of this ASAP

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[grantfox-oss]

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@chiscookeke11's PR #564 was approved and merged by @Chucks1093.

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