next-file-gen-core is a simple and lightweight Next.js App Router sub-file auto-generator.
Automatically generates template files by creating folders with specific naming patterns, such as `[name].default` for all default files and `[name].page` for page components.
Automatically creates a `next-file-gen.config.json` file allowing customization of the watch directory and ignore patterns.
Ensures existing files are not overwritten and generates files with minimal boilerplate code.