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

server/routes/feed.js

@@ -0,0 +1,58 @@
+const express = require('express');
+const router = express.Router();
+const { Feed } = require('feed');
+const contentService = require('../services/content');
+
+function generateFeed(site) {
+  const feed = new Feed({
+    title: site.title,
+    description: site.tagline,
+    id: site.url,
+    link: site.url,
+    language: 'en',
+    image: `${site.url}/images/og-default.png`,
+    favicon: `${site.url}/favicon.ico`,
+    copyright: `All rights reserved ${new Date().getFullYear()}, ${site.author ? site.author.name : site.title}`,
+    author: {
+      name: site.author ? site.author.name : site.title,
+      link: site.url
+    }
+  });
+
+  const posts = contentService.getAllPosts();
+
+  for (const post of posts) {
+    const postUrl = `${site.url}/${post.slug}`;
+    feed.addItem({
+      title: post.title,
+      id: postUrl,
+      link: postUrl,
+      description: post.excerpt,
+      content: post.contentHtml,
+      author: [
+        {
+          name: post.author,
+          link: site.url
+        }
+      ],
+      date: post.date,
+      image: post.cover ? (post.cover.startsWith('http') ? post.cover : `${site.url}${post.cover}`) : undefined
+    });
+  }
+
+  return feed;
+}
+
+router.get(['/feed', '/rss.xml', '/feed.xml'], (req, res) => {
+  const feed = generateFeed(res.locals.site);
+  res.header('Content-Type', 'application/xml; charset=utf-8');
+  res.send(feed.rss2());
+});
+
+router.get('/atom.xml', (req, res) => {
+  const feed = generateFeed(res.locals.site);
+  res.header('Content-Type', 'application/atom+xml; charset=utf-8');
+  res.send(feed.atom1());
+});
+
+module.exports = router;