The P0 templates loaded Alpine.js from cdn.jsdelivr.net and Tailwind from
cdn.tailwindcss.com, so LAN-only demo clients got a login page whose JS never
engaged (stuck form). Vendor both libraries under app/static/vendor/
(alpine-3.17.2.min.js, tailwind-3.4.17.js) served same-origin at /static,
point base.html at local paths, and drop both CDN hosts from the CSP
(script-src/style-src stay 'self' 'unsafe-inline'; connect-src 'self').
HTML pages now ship Cache-Control: no-cache; vendored assets are cached
public, max-age=31536000, immutable (versioned filenames). HSTS stays
TLS-gated. Adds tests/test_frontend_vendoring.py (no external script src on
/login, both vendor paths 200, no-cache + immutable header checks, CSP
without CDN hosts).
fm crewmate
05d768343c