Add employees management module with database schema and validation
- Introduced `EmployeesModule` to manage employee data, including read and write controllers. - Created database migrations for the `employees` table, including constraints and unique indexes. - Implemented validation for employee fields such as name, code, and position with corresponding utility functions. - Developed service and repository layers for handling employee data operations. - Added unit tests for the employees service, repository, and controllers to ensure functionality and correctness. - Updated application module to include the new `EmployeesModule` for better organization.
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