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

src/routes/__tests__/status.test.ts

@@ -0,0 +1,36 @@
+import { describe, it, expect } from 'vitest'
+import request from 'supertest'
+import express from 'express'
+import path from 'path'
+import { fileURLToPath } from 'url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const publicDir = path.join(__dirname, '../../../public')
+
+function createApp() {
+  const app = express()
+  app.use(express.static(publicDir, { etag: true }))
+
+  // Mirror the status route from index.ts
+  app.get('/status', (_req, res) => {
+    res.sendFile(path.join(publicDir, 'status.html'))
+  })
+
+  return app
+}
+
+describe('Status Route', () => {
+  const app = createApp()
+
+  it('GET /status returns 200', async () => {
+    const res = await request(app).get('/status')
+    expect(res.status).toBe(200)
+    expect(res.headers['content-type']).toContain('text/html')
+  })
+
+  it('GET /status.html returns 200', async () => {
+    const res = await request(app).get('/status.html')
+    expect(res.status).toBe(200)
+    expect(res.headers['content-type']).toContain('text/html')
+  })
+})