[MOVIE]: Bon Voyage, Charlie Brown (and Don't Come Back!) (1980)

### Database URL

https://www.themoviedb.org/movie/31112

### YouTube Theme Song Video URL

https://www.youtube.com/watch?v=ktL1pmY8vac

### Additional Information

- [ ] This is a replacement request. If checked, please provide a reason below.

### Replacement Reason

_No response_

Start by verifying the movie at the provided Database URL and the theme song at the YouTube URL. Find the repository’s existing movie and theme-song data entries, then add Bon Voyage, Charlie Brown (and Don't Come Back!) (1980) consistently with them. Done means the movie and its theme song are available in the database.

Written by the indexing model from the issue text.