fix(): 修复重启后切换模式后相机丢失BUG，修复重启后UI绑定失效的BUG，将GameManager移动到Gameplay

Assets/Script/Gameplay/Global/GameManager.cs

@@ -0,0 +1,26 @@
+
+using System;
+using Core;
+namespace Script.Gameplay.Global
+{
+    public class GameManager : MonoSingleton<GameManager>
+    {
+        public event Action OnGameStart;
+        private void Start()
+        {
+            ScenesManager.Instance.LoadMainMenu();
+        }
+
+        public void StartGameplay()
+        {
+            ScenesManager.Instance.LoadGameplay("Level1");
+            OnGameStart?.Invoke();
+        }
+
+        public void StartTest()
+        {
+            ScenesManager.Instance.LoadGameplay("Test");
+            OnGameStart?.Invoke();
+        }
+    }
+}