feat(#84): implement instance identity model for federation
Implemented the foundation of federation architecture with instance
identity and connection management:
Database Schema:
- Added Instance model for instance identity with keypair generation
- Added FederationConnection model for workspace-scoped connections
- Added FederationConnectionStatus enum (PENDING, ACTIVE, SUSPENDED, DISCONNECTED)
Service Layer:
- FederationService with instance identity management
- RSA 2048-bit keypair generation for signing
- Public identity endpoint (excludes private key)
- Keypair regeneration capability
API Endpoints:
- GET /api/v1/federation/instance - Returns public instance identity
- POST /api/v1/federation/instance/regenerate-keys - Admin keypair regeneration
Tests:
- 11 tests passing (7 service, 4 controller)
- 100% statement coverage, 100% function coverage
- Follows TDD principles (Red-Green-Refactor)
Configuration:
- Added INSTANCE_NAME and INSTANCE_URL environment variables
- Integrated FederationModule into AppModule
Refs #84
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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