Replace synchronous HTTP polling with Kafka event-driven model for MPC operations:
- Add MPC event consumer service in mpc-service for keygen/signing requests
- Add keygen-requested and signing-requested event handlers
- Add MPC event consumer in identity-service for completion events
- Extend mpc-client.service with async event-driven methods
- Support backward compatibility via MPC_USE_EVENT_DRIVEN env var
Topics: mpc.KeygenRequested, mpc.SigningRequested, mpc.KeygenCompleted,
mpc.SigningCompleted, mpc.SessionFailed
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Remove Address field from PartyEndpoint (parties connect to router themselves)
- Update K8s Discovery to only manage PartyID and Role labels
- Add Party registration and SessionEvent protobuf definitions
- Implement PartyRegistry and SessionEventBroadcaster domain logic
- Add RegisterParty and SubscribeSessionEvents gRPC handlers
- Prepare infrastructure for party-driven MPC coordination
This is the first phase of migrating from coordinator-driven to party-driven
architecture following international MPC system design patterns.
hailin