The logo was an 880 KB SVG wrapping a 1254px PNG, downloaded again on
every page load. Keep that PNG as the master (artwork/logo.png) and have
scripts/logo.py trace it with potrace into a 6 KB logo.svg (favicon,
README) and logo.js, which brand.js draws inline in the header and on the
login page so the logo arrives with the page. Remove the unused
logo-white.svg.
Static files now carry content ETags, so reloads get 304s instead of
downloading the UI again.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
