Add status route tests, OG images blog post, and blog tests

- Create src/routes/__tests__/status.test.ts (GET /status and /status.html)
- Add blog post: public/blog/automating-og-images.html (~1000 words)
- Update public/blog.html with new post entry
- Update public/sitemap.xml with new URL
- Add blog tests for automating-og-images post
- Update existing blog tests for new post references

Tests: 332 passed, 1 skipped

public/blog.html

@@ -93,6 +93,13 @@ footer{border-top:1px solid var(--border);padding:48px 24px 32px;background:var(
   </div>
 
   <div class="blog-grid">
+    <article class="blog-card">
+      <div class="meta"><span>March 3, 2026</span><span>7 min read</span></div>
+      <h2><a href="/blog/automating-og-images">Automating OG Image Generation with Screenshot APIs</a></h2>
+      <p>Stop designing Open Graph images by hand. Learn how to use screenshot APIs to automatically generate beautiful, dynamic OG images for every page on your site.</p>
+      <a href="/blog/automating-og-images" class="read-more">Read article →</a>
+    </article>
+
     <article class="blog-card">
       <div class="meta"><span>March 2, 2026</span><span>8 min read</span></div>
       <h2><a href="/blog/why-screenshot-api">Why You Need a Screenshot API (And Why Building Your Own Is Harder Than You Think)</a></h2>