6a038d093b
- Integrated BetterAuth library for modern authentication - Added Session, Account, and Verification database tables - Created complete auth module with service, controller, guards, and decorators - Implemented shared authentication types in @mosaic/shared package - Added comprehensive test coverage (26 tests passing) - Documented type sharing strategy for monorepo - Updated environment configuration with OIDC and JWT settings Key architectural decisions: - BetterAuth over Passport.js for better TypeScript support - Separation of User (DB entity) vs AuthUser (client-safe subset) - Shared types package to prevent FE/BE drift - Factory pattern for auth config to use shared Prisma instance Ready for frontend integration (Issue #6). Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com> Fixes #4