Option to stop download on first already downloaded file

[virtualzx-nad]

Original issue: RipMeApp#2010

Problem:
Currently, the ripper continues downloading even after encountering already downloaded files. Users should have the option to stop the download when the first already-downloaded file is encountered.

Requirements:

1. Add a new configuration option for this behavior
2. Implement the stop logic in AbstractRipper
3. Add appropriate user feedback
4. Include tests
5. Update documentation

Difficulty: Beginner-friendly
Type: Enhancement