Add auth.mischlabs.de as wide banner card above service grid

Horizontal banner layout with shield icon, spanning full grid width.
Responsive: collapses to vertical on mobile.

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

style.css

@@ -126,6 +126,27 @@ main {
     gap: 1.25rem;
 }
 
+/* ===== Banner Card (Auth) ===== */
+.card-banner {
+    flex-direction: row;
+    align-items: center;
+    gap: 1rem;
+    padding: 1rem 1.5rem;
+    margin-bottom: 1.25rem;
+    animation: fadeInUp 0.5s ease backwards;
+}
+
+.card-banner .card-content {
+    flex: 1;
+}
+
+.card-banner .card-domain {
+    border-top: none;
+    padding-top: 0;
+    border-left: 1px solid var(--border);
+    padding-left: 1rem;
+}
+
 /* ===== Card ===== */
 .card {
     display: flex;
@@ -265,9 +286,24 @@ footer p {
         width: 20px;
         height: 20px;
     }
+
+    .card-banner {
+        margin-bottom: 0.75rem;
+    }
 }
 
 @media (max-width: 480px) {
+    .card-banner {
+        flex-direction: column;
+        align-items: flex-start;
+    }
+
+    .card-banner .card-domain {
+        border-left: none;
+        padding-left: 0;
+        border-top: 1px solid var(--border);
+        padding-top: 0.5rem;
+    }
     .grid {
         grid-template-columns: 1fr;
     }