Create API Error Reference

[Abd-Standard]

Description

Document all API error responses with explanations and recommended resolutions.

Acceptance Criteria
Error codes are listed.
Descriptions are included.
Examples are provided.

[GazzyLee]

gm gm boss, I'd be happy to take this on. I'll document every API error response in a dedicated reference, including the error code, what it means, common causes, recommended resolutions, and example request/response payloads so developers can troubleshoot issues quickly and consistently. ETD is in 4 hours tops, please assign

[OluRemiFour]

@OluRemiFour has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I'd be glad to handle this issue. I'll keep the implementation concise, maintainable, and well-documented.

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