feat: initial release of pengzhan.dev personal editorial blog platform

- Editorial web platform built with Node.js, Express, EJS, and Vanilla CSS
- Markdown content engine with YAML frontmatter, bilingual variants, and hot-reload watcher
- Unified SQLite with FTS5 search indexing, query logging, and schema filters
- Centered editorial post layout with margin-docked left TOC and mobile bottom sheet
- WordPress-grade comment system with moderation dashboard and bulk operations under /guanli
- Complete SEO suite (JSON-LD structured data, RSS/Atom feeds, XML sitemap, robots.txt)
- CI/CD workflows for linting, security audits (Gitleaks), automated tests, and Docker releases

sample-content/plugins/reading-time/index.js

@@ -0,0 +1,18 @@
+module.exports = {
+  onPostLoad({ post }) {
+    const wordCount = (post.rawContent || '').trim().split(/\s+/).length;
+    // Assume average 200 words per minute
+    const minutes = Math.max(1, Math.round(wordCount / 200));
+    post.readingTime = `${minutes} min read`;
+    post.wordCount = wordCount;
+  },
+
+  injectPostEnd({ post }) {
+    if (post && post.readingTime) {
+      return `<div style="font-family: var(--font-sans); font-size: 0.85rem; color: var(--color-text-muted); margin-top: 2rem; padding: 0.75rem 1rem; background: var(--color-surface-soft); border-radius: var(--radius-sm);">
+        Article statistics: ~${post.wordCount} words &bull; ${post.readingTime}
+      </div>`;
+    }
+    return '';
+  }
+};