Implements federated authentication infrastructure using OIDC:
- Add FederatedIdentity model to Prisma schema for identity mapping
- Create OIDCService with identity linking and token validation
- Add FederationAuthController with 5 endpoints:
* POST /auth/initiate - Start federated auth flow
* POST /auth/link - Link identity to remote instance
* GET /auth/identities - List user's federated identities
* DELETE /auth/identities/:id - Revoke identity
* POST /auth/validate - Validate federated token
- Create comprehensive type definitions for OIDC flows
- Add audit logging for security events
- Write 24 passing tests (14 service + 10 controller)
- Achieve 79% coverage for OIDCService, 100% for controller
Notes:
- Token validation and auth URL generation are placeholder implementations
- Full JWT validation will be added when federation OIDC is actively used
- Identity mappings enforce workspace isolation
- All endpoints require authentication except /validate
Refs #86
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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