feat(index): show bilingual noscript hint before app boot

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/index.html

@@ -51,6 +51,13 @@
     </script>
   </head>
   <body>
+    <noscript>
+      <div class="page-shell footer-shell">
+        <div class="panel noscript-panel">
+          <p class="warning-text">Please enable JavaScript for the full experience. / Bitte aktiviere JavaScript, um alles zu sehen.</p>
+        </div>
+      </div>
+    </noscript>
     <app-root></app-root>
   </body>
 </html>