[Feature Request] Support for custom user scripts in the context menu (like Nautilus scripts)

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Hi!

It would be great if Lingmo File Manager could support custom user scripts in the context menu, similar to how Nautilus (GNOME Files) handles it.

In Nautilus, users can place executable scripts in the directory:

```
~/.local/share/nautilus/scripts/
```

Then, those scripts automatically appear in the context menu when right-clicking files or folders. This allows users to easily create their own file actions without modifying the file manager itself.

For example, I maintain a set of useful scripts here:
https://github.com/cfgnunes/fm-scripts

Having similar functionality in Lingmo File Manager would make it much more flexible and customizable for users.

**Suggested behavior:**

* Add a configurable directory for user scripts (e.g. `~/.local/share/lingmo-filemanager/scripts/`).
* Show available scripts in the context menu based on the selected file(s) or folder(s).
* Optionally, pass file paths as arguments to the scripts.

This would be a simple but powerful feature to extend the functionality and help users automate tasks.

**Example:**

Thanks for the great work!

No source file or test is named in the issue. Start by locating Lingmo File Manager's context-menu implementation, then determine how a configurable user-script directory and selected file paths would integrate; done means executable scripts appear appropriately in the context menu and receive the selected paths as arguments.

Written by the indexing model from the issue text.