Adding Persian Language

### Check List

- [x] I have already read [Docs page](https://hexo.io/docs/).
- [x] I have already searched existing issues.

### Feature Request

I hope you guys doing well, I was really amazed with this repo, but supporting for persian(Farsi) language was missing.
I can help with that and make a pull request for it to be added to the project, please let me know if you look for it

### Others

_No response_

Start by reviewing the Hexo site and its linked documentation to identify how language support is currently structured. The issue names no files or tests, so first clarify the localization scope and entry points; done should mean Persian/Farsi support is defined and added consistently across the site.

Written by the indexing model from the issue text.