fix: ensure HttpCode annotations for specific endpoints in users and groups controllers
refactor: enhance person handling logic in groups service for better e2e test support
fix: improve CORS configuration for handling additional origins
feat: add @Public decorator to app controller's root endpoint
refactor: modify projects controller to return JSON responses for check-access endpoint
Added comprehensive unit tests for `UsersController` and `UsersService`, covering CRUD operations, GDPR consent updates, data export, and exception handling. Mocked `JwtAuthGuard` and database operations for all tests.
Added new authentication strategies (JWT and GitHub OAuth), guards, and controllers. Implemented database module, schema with relations, and group management features, including CRD operations and person-to-group associations. Integrated validation and CORS configuration.
