feat: self-host all external assets + larger base font

- Vendor Google Fonts: 23 woff2 + localized fonts.css under
  public/fonts/, referenced via /fonts/fonts.css. Drop the
  googleapis/gstatic preconnects and the (now unused) Font Awesome
  CDN link. No runtime external resource requests remain.
- Dockerfile copies public/fonts into the nginx image.
- html base font-size 16 -> 17px (all rem UI text scales up slightly).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -19,6 +19,7 @@ COPY package*.json ./
 
 COPY --from=build-stage /app/dist /usr/share/nginx/html
 COPY --from=build-stage /app/public/icons /usr/share/nginx/html/icons
+COPY --from=build-stage /app/public/fonts /usr/share/nginx/html/fonts
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 COPY BuildConfig.sh /docker-entrypoint.d/10-build-config.sh
 RUN chmod a+x /docker-entrypoint.d/10-build-config.sh