Fix package name references to muvera-python

[craftsangjae]

Summary

• Update all pip install muvera references to pip install muvera-python across docs
• Update PyPI URLs from /project/muvera/ to /project/muvera-python/
• Fix trusted publisher project name in RELEASE_GUIDE.md

Files changed

• README.md — installation command
• RELEASE_GUIDE.md — all pip install, PyPI URLs, trusted publisher config
• .github/workflows/publish.yml — GitHub Release installation command and PyPI link

Test plan

• Grep confirms no remaining pip install muvera (without -python) in docs
• All PyPI URLs point to muvera-python