feat(security): implement ZK-KYC nullifier registry with on-chain anchoring

[Moeabdelaziz007]

This PR implements the ZK-KYC nullifier registry to prevent proof replay attacks.

Key changes:

• Created NullifierRegistry with TTL logic, an in-memory fallback, and Upstash Redis integration
• Added an API route for explicitly triggering nullifier expiry pruning
• Modified verifyProof in index.ts to check nullifiers during verification and throw ProofReplayError
• Added comprehensive unit tests for TTL, replay prevention, and Upstash failover
• Updated AXIOM.md with new ZK-KYC security guarantees

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PR created automatically by Jules for task 5211477336914530391 started by @Moeabdelaziz007

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Project	Deployment	Actions	Updated (UTC)
aix-format-studio	Error		May 1, 2026 6:39pm