fix: 片头动画改为用户触发而非自动播放

- OpeningFlowController: Start() 不再自动播放动画，新增 PlayOpeningFlow(Action onComplete) 公开方法
- PageController: OnFixationSelected() 先隐藏所有UI面板，调用 PlayOpeningFlow，动画结束后再显示 ExperimentPanel
- 新增 HideAllPages() 方法用于片头动画期间清空UI
- 所有按钮回调均保留 Debug.Log 输出

Assets/Scripts/UI/PageController.cs

@@ -208,6 +208,19 @@ public class PageController : MonoBehaviour
             _uiManager.enabled = (page == Page.Experiment);
     }
 
+    /// <summary>
+    /// 隐藏所有页面，用于播放片头动画时清空 UI
+    /// </summary>
+    private void HideAllPages()
+    {
+        Debug.Log("PageController: [HideAllPages] 隐藏所有 UI 面板");
+        if (_homePagePanel != null) _homePagePanel.SetActive(false);
+        if (_modeSelectPanel != null) _modeSelectPanel.SetActive(false);
+        if (_fixationPanel != null) _fixationPanel.SetActive(false);
+        if (_experimentPanel != null) _experimentPanel.SetActive(false);
+    }
+
+
     #endregion
 
     #region 按钮回调
@@ -261,7 +274,7 @@ public class PageController : MonoBehaviour
 
     private void OnFixationSelected(FixationMethod method)
     {
-        Debug.Log($"PageController: [FixationSelected] 点击 -> 固定方式 [{method}] -> 切换到 Experiment");
+        Debug.Log($"PageController: [FixationSelected] 点击 -> 固定方式 [{method}]");
         var gm = GameManager.Instance;
         if (gm == null)
         {
@@ -273,17 +286,42 @@ public class PageController : MonoBehaviour
         gm.CurrentFixationMethod = method;
         Debug.Log($"PageController: GameManager 已设置 Mode=[{gm.CurrentMode}] Fixation=[{gm.CurrentFixationMethod}]");
 
-        ShowPage(Page.Experiment);
+        // 隐藏所有UI面板，准备播放片头动画
+        HideAllPages();
 
-        var stepManager = FindObjectOfType<StepManager>();
-        if (stepManager != null)
+        // 找到 OpeningFlowController 播放片头动画
+        var openingFlow = FindObjectOfType<OpeningFlowController>();
+        if (openingFlow != null)
         {
-            stepManager.InitializeFromGameManager();
-            Debug.Log("PageController: StepManager.InitializeFromGameManager() 已调用");
+            Debug.Log("PageController: 开始播放片头动画，ExperimentPanel 将在动画结束后显示");
+            openingFlow.PlayOpeningFlow(() =>
+            {
+                Debug.Log("PageController: 片头动画完成，显示 ExperimentPanel");
+                ShowPage(Page.Experiment);
+
+                var stepManager = FindObjectOfType<StepManager>();
+                if (stepManager != null)
+                {
+                    stepManager.InitializeFromGameManager();
+                    Debug.Log("PageController: StepManager.InitializeFromGameManager() 已调用");
+                }
+                else
+                {
+                    Debug.LogWarning("PageController: 未找到 StepManager，实验步骤不会自动初始化");
+                }
+            });
         }
         else
         {
-            Debug.LogWarning("PageController: 未找到 StepManager，实验步骤不会自动初始化");
+            Debug.LogWarning("PageController: 未找到 OpeningFlowController，直接显示 ExperimentPanel");
+            ShowPage(Page.Experiment);
+
+            var stepManager = FindObjectOfType<StepManager>();
+            if (stepManager != null)
+            {
+                stepManager.InitializeFromGameManager();
+                Debug.Log("PageController: StepManager.InitializeFromGameManager() 已调用");
+            }
         }
     }