- Add shared BlogMD renderer (static/js/markdown.js): marked + DOMPurify
+ highlight.js pipeline with GFM support, heading id slugger with
CJK-aware anchors, syntax highlighting, per-block copy button and
language badge, lazy images with lightbox, external links opened
safely in new tabs, tables wrapped for small screens.
- Add .md-body typography styles (static/css/markdown.css) so articles,
comments and editor previews render with proper headings, tables,
lists, blockquotes and code blocks (previously the prose classes had
no effect because the Tailwind typography plugin is not loaded).
- Fix marked options that were set after parsing and removed from
marked v4+ (mangle/headerIds no-ops).
- Pin CDN versions (marked 15.0.12, dompurify 3.4.13, highlight.js
11.12.0) instead of floating 'latest' URLs.
- Wire EasyMDE preview/side-by-side to BlogMD in admin and user
article editors; use BlogMD for comment bodies on the article page,
admin comment list and comment preview.
- Serve /static in main.go and deploy it in install_linux.sh.
