chore(public): 页脚添加 ICP 备案号 鲁ICP备2025185218号-6

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

public-frontend/src/App.tsx

@@ -79,6 +79,16 @@ export default function App() {
           <button onClick={() => setView({ name: "api" })} className="ml-1 text-emerald-600 hover:underline">
             API 调用说明
           </button>
+          <div className="mt-2">
+            <a
+              href="https://beian.miit.gov.cn/"
+              target="_blank"
+              rel="noreferrer"
+              className="hover:text-gray-600"
+            >
+              鲁ICP备2025185218号-6
+            </a>
+          </div>
         </div>
       </footer>
     </div>