refactor: Make main function exportable and callable

This change refactors the `index.js` file to allow the `main` function to be both exportable and callable by other modules. The original code executed `main` directly when the script was run as the main module. This behavior has been removed to improve modularity and testability. Now the `main` function can be imported and called explicitly, enabling better integration with testing frameworks and other parts of the application.

The conditional execution `if (require.main === module) { main(); }` has been removed.

Author: ioncakephper

src/index.js

@@ -13,10 +13,6 @@ async function main() {
   }
 }
 
-if (require.main === module) {
-  main();
-}
-
 module.exports = {
   main,
 };