Build verification service for on-chain KYC/AML compliance

[Smartdevs17]

Description

Create an integration with KYC/AML providers for user verification, with on-chain attestation storage enabling compliance while preserving privacy.

Acceptance Criteria

• KYC provider integration (Civic, Fractal ID)
• AML screening integration with watchlist checking
• On-chain attestation of verification status
• Tiered verification levels (basic, enhanced, institutional)
• Re-verification schedule (annual for basic, biannual for enhanced)
• Privacy-preserving proof of verification (ZK option)

Technical Scope

• api/src/controllers/verification.controller.ts
• api/src/routes/verification.routes.ts
• api/src/services/
• Edge: attestation revocation, verification expiry, jurisdiction-specific rules