Restructure README to the standard OSS layout (logo, badges, screenshots
grid, architecture, quick start). Add install.sh for curl|sh installs with
a named-volume fallback for Docker Desktop file-sharing limits, and
scripts/setup.sh for clone-based setup. Correct SECURITY.md (no longer
pre-1.0) and CONTRIBUTING.md (auth shipped in 2.0.0).
Authored By: TDvorak <[email protected]>
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
