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- Introduced a new contact management feature, including the ability to create, retrieve, search, update, and delete contact messages. - Implemented the Contact entity, repository, service, and handler layers following Clean Architecture principles. - Added API endpoints for contact operations in Swagger documentation, ensuring comprehensive API specifications. - Enhanced error handling and validation for contact data, improving robustness and user experience. - Updated the main application to initialize the contact repository and service, integrating them into the existing system.