Added `README.md` to document the database migration system, including generation and usage instructions. Updated `generate-migrations.ts` to fix directory structure and streamline commands. Included initial migration files for schema setup using DrizzleORM.
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.
