feat(kyc): add delete of an org kyc record

[whoAbhishekSah]

Part of #1835. Stacked on the credit delete PR.

The org_kyc row references the organization row, and nothing could remove it, which blocked the hard delete of an organization.

Changes

• Delete on the kyc Postgres repository.
• DeleteKyc on the kyc service.
• Regenerated the kyc repository mock.

No behavior change: nothing calls these yet.

🤖 Generated with Claude Code

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[rohilsurana]

Reviewed as part of the stack. No suggestions here. The idempotent delete is the right call for a retryable teardown, and the error mapping matches the rest of the file.