fix(og): resolve font corruption and Next.js 15+ params compatibility

- Replaced corrupted HTML font files with binary WOFF2 versions.
- Updated all opengraph-image.tsx files to await params, as required by Next.js 15+.
- Improved OG image reliability by using SITE_URL for absolute image paths.
- Added scripts/check-og-images.ts for automated production verification.
- Integrated smoke_test job into deployment pipeline.

scripts/check-og-images.ts

@@ -0,0 +1,72 @@
+import fetch from 'node-fetch';
+import { SITE_URL } from '../lib/schema.js';
+
+const BASE_URL = process.env.TEST_URL || SITE_URL;
+
+console.log(`\n🚀 Starting OG Image Verification for ${BASE_URL}\n`);
+
+const routes = [
+  '/de/opengraph-image',
+  '/en/opengraph-image',
+  '/de/blog/opengraph-image',
+  '/de/api/og/product?slug=nay2y',
+  '/en/api/og/product?slug=medium-voltage-cables',
+];
+
+async function verifyImage(path: string): Promise<boolean> {
+  const url = `${BASE_URL}${path}`;
+  const start = Date.now();
+
+  try {
+    const response = await fetch(url);
+    const duration = Date.now() - start;
+
+    console.log(`Checking ${url}...`);
+
+    if (response.status !== 200) {
+      throw new Error(`Status: ${response.status}`);
+    }
+
+    const contentType = response.headers.get('content-type');
+    if (!contentType?.includes('image/png')) {
+      throw new Error(`Content-Type: ${contentType}`);
+    }
+
+    const buffer = await response.arrayBuffer();
+    const bytes = new Uint8Array(buffer);
+
+    // PNG Signature: 89 50 4E 47 0D 0A 1A 0A
+    if (bytes[0] !== 0x89 || bytes[1] !== 0x50 || bytes[2] !== 0x4e || bytes[3] !== 0x47) {
+      throw new Error('Invalid PNG signature');
+    }
+
+    if (bytes.length < 10000) {
+      throw new Error(`Image too small (${bytes.length} bytes), likely blank`);
+    }
+
+    console.log(`  ✅ OK (${bytes.length} bytes, ${duration}ms)`);
+    return true;
+  } catch (error: unknown) {
+    const message = error instanceof Error ? error.message : String(error);
+    console.error(`  ❌ FAILED: ${message}`);
+    return false;
+  }
+}
+
+async function run() {
+  let allOk = true;
+  for (const route of routes) {
+    const ok = await verifyImage(route);
+    if (!ok) allOk = false;
+  }
+
+  if (allOk) {
+    console.log('\n✨ All OG images verified successfully!\n');
+    process.exit(0);
+  } else {
+    console.error('\n⚠️  Some OG images failed verification.\n');
+    process.exit(1);
+  }
+}
+
+run();