docs: Add social media badges and links

- Add Twitter/X follow badge to both READMEs (English and Chinese)
- Add GitHub stars badge for social proof
- Add Author link to pyproject.toml pointing to X profile
- Set repository homepage URL to skillseekersweb.com

These changes improve discoverability and community engagement.

README.zh-CN.md

@@ -20,6 +20,8 @@
 [![PyPI - 下载量](https://img.shields.io/pypi/dm/skill-seekers.svg)](https://pypi.org/project/skill-seekers/)
 [![PyPI - Python 版本](https://img.shields.io/pypi/pyversions/skill-seekers.svg)](https://pypi.org/project/skill-seekers/)
 [![官方网站](https://img.shields.io/badge/Website-skillseekersweb.com-blue.svg)](https://skillseekersweb.com/)
+[![关注 Twitter](https://img.shields.io/twitter/follow/_yUSyUS_?style=social)](https://x.com/_yUSyUS_)
+[![GitHub Stars](https://img.shields.io/github/stars/yusufkaraaslan/Skill_Seekers?style=social)](https://github.com/yusufkaraaslan/Skill_Seekers)
 
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