adiciona modelo real

frontend/src/components/Layout.tsx

@@ -19,6 +19,14 @@ export function Layout() {
             Quiz
           </NavLink>
         </nav>
+        <a
+          href="https://github.com/LluisV/Z-Anatomy-Sample"
+          target="_blank"
+          rel="noreferrer"
+          className="ml-auto text-[11px] text-slate-500 hover:text-slate-300"
+        >
+          Modelos 3D: projeto Z-Anatomy (CC BY-SA 4.0)
+        </a>
       </header>
       <main className="flex-1 min-h-0">
         <Outlet />