Release v2.0.0 - Multi-OS Support & Critical Fixes

Major release with multi-OS support (macOS + Linux), development mode, and all critical bug fixes from user feedback.

Key changes:
- Multi-OS support (Debian/Ubuntu + macOS)
- Development mode (git clone + build + link)
- DBus auto-configuration
- Homebrew integration
- PNPM configuration fixes
- Dynamic user-ID detection
- All lints passing

See RELEASE_NOTES_v2.0.0.md for full details.