perf(game): 优化FPS显示更新机制

- 移除基于时间戳的条件判断逻辑
- 改用固定间隔的线程休眠实现FPS更新
- 添加异常处理防止中断异常影响程序运行
- 简化代码结构提高可读性

Author: ShirosakiMio

FCL/src/main/java/com/tungsten/fcl/control/GameMenu.java

@@ -446,9 +446,10 @@ private void initRightMenu() {
                 Schedulers.io().execute(() -> {
                     FCLBridge.getFps();
                     while (showFps.isChecked()) {
-                        if (System.currentTimeMillis() - time >= 1000) {
-                            Schedulers.androidUIThread().execute(() -> fpsText.setText("FPS:" + FCLBridge.getFps()));
-                            time = System.currentTimeMillis();
+                        Schedulers.androidUIThread().execute(() -> fpsText.setText("FPS:" + FCLBridge.getFps()));
+                        try {
+                            Thread.sleep(1000);
+                        } catch (InterruptedException ignored) {
                         }
                     }
                 });