Implement hexagonal architecture

<!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Complete architectural redesign with new HTTP API endpoints for account creation, login, and status retrieval. * Added support for LDAP-based authentication and user provisioning. * Implemented token refresh mechanism for extended session management. * Added email notification service integration with RabbitMQ. * Added multi-factor authentication (TOTP) support. * **Chores** * Restructured codebase to hexagonal architecture with separate domain, application, and adapter layers. * Migrated to PostgreSQL with database schema migrations. * Updated Docker configuration and deployment structure. <!-- end of auto-generated comment: release notes by coderabbit.ai -->