Rewrite README with centered header, shields.io badges, mermaid topology
and session key diagrams, restructured installation section with Windows
quick start guide, and release documentation.
Add CHANGELOG.md for v0.2.0 and Gitea Actions release workflow that
builds source archives (tar.gz + zip) and publishes them on tag push.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
