Backend: Ensure consistent error payloads with requestId across routes

[mimijuwonlo-commits]

Why

Some error responses (e.g., in distribute path) omit
equestId. All errors should match RequestIdError.

Scope

• Audit routes to ensure { error, message, requestId, details? } for 4xx/5xx.
• Adjust global error handler to avoid masking known error types.

Acceptance

• Contract tests confirm
  equestId included on all error responses.

[Elite-tch]

@Elite-tch has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Please can i work on this issue

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[drips-wave]

Congratulations, @Elite-tch! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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