Implement threshold cryptography for distributed proof security**

[jobbykings]

Create advanced threshold cryptography implementation for distributed proof security, shared secret management, and collaborative proof authentication.

Requirements:
Threshold cryptography implementation
Distributed proof security
Shared secret management
Collaborative proof authentication
Threshold security guarantees
Distributed system optimization

Acceptance Criteria:
GIVEN threshold cryptography, WHEN applied, THEN security requires multiple parties
GIVEN distributed security, WHEN implemented, THEN no single point of failure exists
GIVEN shared secret, WHEN managed, THEN no single party has full control
GIVEN collaborative authentication, WHEN active, THEN proof verification requires collaboration
GIVEN optimization, WHEN applied, THEN threshold operations are efficient

Files to Work On:

Backend:

backend/src/thresholdcrypto/ThresholdCryptography.ts (new)
backend/src/thresholdcrypto/DistributedSecurity.ts (new)
backend/src/thresholdcrypto/SecretManager.ts (new)
backend/src/thresholdcrypto/CollaborativeAuthenticator.ts (new)
backend/src/services/ThresholdCryptoService.ts (new)

Frontend:

frontend/src/components/ThresholdCrypto/DistributedSecurity.tsx (new)
frontend/src/components/ThresholdCrypto/CollaborativeAuth.tsx (new)