Add MiChess service tile to landing page

New tile for michess.mischlabs.de (chess) with chess piece icon
and staggered animation delay for 9th card.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

index.html

@@ -131,6 +131,24 @@
                 <span class="card-domain">docs.mischlabs.de</span>
             </a>
 
+            <a href="https://michess.mischlabs.de" class="card" target="_blank" rel="noopener">
+                <div class="card-icon" style="--accent: #10b981;">
+                    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
+                        <path d="M8 16l-1 4h10l-1-4"/>
+                        <path d="M6.5 16h11"/>
+                        <path d="M12 2a2 2 0 0 1 2 2c0 1.1-.9 2-2 3-1.1-1-2-1.9-2-3a2 2 0 0 1 2-2z"/>
+                        <path d="M9 7L6 10.5c-.6.7-.2 1.5.7 1.5h10.6c.9 0 1.3-.8.7-1.5L15 7"/>
+                        <path d="M9 12v4"/>
+                        <path d="M15 12v4"/>
+                    </svg>
+                </div>
+                <div class="card-content">
+                    <h2>MiChess</h2>
+                    <p>Schach</p>
+                </div>
+                <span class="card-domain">michess.mischlabs.de</span>
+            </a>
+
             <a href="https://tom.mischlabs.de" class="card" target="_blank" rel="noopener">
                 <div class="card-icon" style="--accent: #ec4899;">
                     <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">

style.css

@@ -301,3 +301,4 @@ footer p {
 .card:nth-child(6) { animation-delay: 0.3s; }
 .card:nth-child(7) { animation-delay: 0.35s; }
 .card:nth-child(8) { animation-delay: 0.4s; }
+.card:nth-child(9) { animation-delay: 0.45s; }