Add forui ui library

[kawaijoe]

Please read How to contribute before creating a submission.

Description and links to repo and pubdev if any

Forui is a UI library that provides a set of minimalistic widgets heavily inspired by shadcn/ui.

For some context, these are the newest widgets we've added in our latest release.

https://github.com/user-attachments/assets/37a4b7b6-7941-42a2-9715-e6ae2dfed398

In addition, I noticed a broken link for Flutter Bounty Hunters and fixed it.

Submission description/links here GitHub: https://github.com/forus-labs/forui Pub.dev: https://pub.dev/packages/forui Website: https://forui.dev/

---

Checklist

• [x] I read How to contribute
• [x] I edited the SOURCE.md file only
• [x] Added a link to the repo in the PR

---

Feel free to add this badge to your repository after it's accepted to awesome-flutter.

<a href="https://github.com/Solido/awesome-flutter">
   <img alt="Awesome Flutter" src="https://img.shields.io/badge/Awesome-Flutter-blue.svg?longCache=true&style=flat-square" />
</a>