Update README.md

Update README.md

docs: update README with account selection strategy feature

feat: add account selection strategy setting

feat: add proxy version display in settings footer

docs: add roadmap and TODO with planned improvements

chore: use VERSION file as single source of truth

fix: add node path to environment for GUI app compatibility

docs: require build from source, disable release workflow

Update appcast.xml for v1.0.0

ci: switch to ad-hoc signing for GitHub releases

docs: enhance README with comprehensive documentation and screenshots

feat: add installation check and improve user guidance

feat: add Command+Q keyboard shortcut and improve settings UI

feat: initial commit - AntiGravity Claude Proxy Bar macOS app