hailin aa74e2b2e2 feat(mpc-system): add signing parties configuration and delegate signing support ... - Add signing-config API endpoints (POST/PUT/DELETE/GET) for configuring which parties should participate in signing operations - Add SigningParties field to Account entity with database migration - Modify CreateSigningSession to use configured parties if set, otherwise use all active parties (backward compatible) - Add delegate party signing support: user provides encrypted share at sign time for delegate party to use - Update protobuf definitions for DelegateUserShare in session events - Add ShareTypeDelegate to support hybrid custody model API endpoints: - POST /accounts/:id/signing-config - Set signing parties (first time) - PUT /accounts/:id/signing-config - Update signing parties - DELETE /accounts/:id/signing-config - Clear config (use all parties) - GET /accounts/:id/signing-config - Get current configuration 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>		2025-12-05 22:47:55 -08:00
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main.go	feat(mpc-system): add signing parties configuration and delegate signing support	2025-12-05 22:47:55 -08:00