Add Patterns and Templates to homepage navigation and card grid

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: infracore

index.html

@@ -68,6 +68,10 @@ <h3>MCP Server</h3>
         <h3>Templates</h3>
         <p>CLAUDE.md governance templates for 10 popular API frameworks.</p>
       </a>
+      <a href="/docs/patterns/" class="card">
+        <h3>Patterns</h3>
+        <p>OpenAPI design patterns for pagination, errors, versioning, auth, and filtering.</p>
+      </a>
     </div>
 
     <h2>Install</h2>