- Keep Dioxus SSR comments (<!--#-->, <!--node-id<N>-->, <!--placeholder-->)
during HTML minification to avoid hydration failures.
- Drop the per-URL minify cache in the Axum middleware: the same URL can
render differently for logged-in vs anonymous users, so URL-level caching
risks leaking admin UI into public responses.
- Let the middleware handle HTML minification once instead of minifying in
markdown rendering as well.
- Consolidate CSS comment stripping into the existing minify_css path and
add a benchmark for html_minify.