Session 45: support email, audit fixes (template validation, content-type, admin auth, waitUntil)

- Added support@docfast.dev to footer, impressum, terms, landing page, openapi.json
- Fixed audit #6: Template render validates required fields (400 on missing)
- Fixed audit #7: Content-Type check on markdown/URL routes (415)
- Fixed audit #11: /v1/usage and /v1/concurrency now require ADMIN_API_KEY
- Fixed audit Critical #3: URL convert uses domcontentloaded instead of networkidle0

public/src/impressum.html

@@ -32,7 +32,8 @@
 
     <h2>Responsible for Content</h2>
     <p>Cloonar Technologies GmbH<br>
-    Legal contact: <a href="mailto:legal@docfast.dev">legal@docfast.dev</a></p>
+    Legal contact: <a href="mailto:legal@docfast.dev">legal@docfast.dev</a><br>
+    Support: <a href="mailto:support@docfast.dev">support@docfast.dev</a></p>
 
     <h2>Disclaimer</h2>
     <p>Despite careful content control, we assume no liability for the content of external links. The operators of the linked pages are solely responsible for their content.</p>

public/src/index.html

@@ -156,7 +156,7 @@
 <li>5,000 PDFs per month</li>
           <li>All conversion endpoints</li>
           <li>All templates included</li>
-          <li>Priority support</li>
+          <li>Priority support (<a href="mailto:support@docfast.dev">support@docfast.dev</a>)</li>
         </ul>
         <button class="btn btn-primary" style="width:100%" id="btn-checkout">Get Started →</button>
       </div>

public/src/terms.html

@@ -48,7 +48,7 @@
       <li><strong>Price:</strong> €9 per month</li>
       <li><strong>Monthly limit:</strong> 10,000 PDF conversions</li>
       <li><strong>Rate limit:</strong> Higher limits based on fair use</li>
-      <li><strong>Support:</strong> Priority email support</li>
+      <li><strong>Support:</strong> Priority email support (<a href="mailto:support@docfast.dev">support@docfast.dev</a>)</li>
       <li><strong>Billing:</strong> Monthly subscription via Stripe</li>
     </ul>