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Add initial setup and configuration for CodeIgniter 4 application

- Create setup script for environment setup and dependencies installation
- Add fix-and-run script for PHP intl extension installation
- Implement PHPUnit configuration with phpunit.xml.dist
- Add preload script for OPcache preloading
- Configure .htaccess for public and writable directories
- Create index.php as the front controller for the application
- Add favicon and robots.txt for web application
- Implement run script to start the CodeIgniter server
- Create example database migration and seeder for testing
- Add example tests for database and session functionality
- Include necessary directories and files for testing
- Set up writable directory with appropriate permissions and index.html for security
- Initialize JSON files for stock and orders data