[Backend] -- Add Operational Runbook Links and Error Mapping for Common Failures

[Devsol-01]

Description:
When errors occur, developers benefit from actionable guidance. Enhance error responses so that common errorCodes map to runbook/docs URLs.

Implement:

• a mapping from errorCode → docsUrl
• include docsUrl in standardized error payloads for known error codes
• add runbook documentation for at least the top 20 error codes

Acceptance Criteria:

• Error response includes docsUrl where supported.
• Runbook pages added and referenced.

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[Caneryy]

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

Hi, can I work on this issue?

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[Whiznificent]

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

gm maintainer i will like to work on this issue

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[TheShnider]

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

I would like to work on this.

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[MztaKing]

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

Dear Team, i will appreciate the opportunity to work on this issue. thank you

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[drips-wave]

Congratulations, @MztaKing! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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