feat: responsive desing

feat: load api from .env

kittyurl-frontend/src/components/FlappyCat.tsx

@@ -218,9 +218,7 @@ export const FlappyCat: React.FC<{ onBack: () => void }> = ({ onBack }) => {
                     </div>
                 )}
             </div>
-            <p className="mt-4 text-slate-400 text-sm font-bold uppercase tracking-widest">
-                Physics: {isPlaying ? "Frame-Independent" : "Ready"}
-            </p>
+            
         </div>
     );
 };