feat(backend): add endpoint to list dispute history and evidence for …

[Killerjunior]

Closes #772

Description

Key changes:

• Added GET /api/bounties/:id/disputes returning all recorded dispute events for a given bounty.
• Extracted and structured dispute records (including reason, evidence link/IPFS CID, timestamps, and resolution outcome) dynamically from the audit log and contract event transitions without redundant state storage.
• Ensured bounties with no dispute history return an empty array ([]) with HTTP 200 rather than a 404.
• Extended disputeBountySchema and disputeBounty to support optional evidence submissions when opening a dispute.
• Added comprehensive unit and integration tests covering dispute history, evidence linking, resolution outcomes, and edge cases.
• Updated OpenAPI documentation and spec snapshots.

Type of change

• Bug fix
• New feature
• Breaking change

Security Checklist

• Input validation changed (added optional evidence field validation to disputeBountySchema)
• Auth modified
• New external fetch
• Dependency added
• Secret handling

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