修改退出判断方式：下一场景名称为“game_exit”时退出游戏

src/scenes/base_scene.py

@@ -25,4 +25,10 @@ class BaseScene:
         """
         切换场景
         """
-        self.next_scene = scene_name
+        self.next_scene = scene_name
+
+    def exit(self):
+        """
+        退出游戏
+        """
+        self.next_scene = "game_exit"