fix: Previous/Next走对woman步进 + 开场动画支持重复播放

- PreviousStep/NextStep: woman自由步进优先于Config路径
- UpdateTouchVisibility: 修正索引 i==step (之前错误地用step-1)
- PlayOpeningFlow: 每次调用前重置man/man2/摄像机状态，支持返回重来
- PageController: 移除InitializeFromGameManager调用，不再覆盖woman步进

Assets/Scripts/UI/PageController.cs

@@ -309,8 +309,6 @@ public class PageController : MonoBehaviour
                 var stepManager = FindObjectOfType<StepManager>();
                 if (stepManager != null)
                 {
-                    stepManager.InitializeFromGameManager();
-                    Debug.Log("PageController: StepManager.InitializeFromGameManager() 已调用");
                 }
                 else
                 {
@@ -326,8 +324,6 @@ public class PageController : MonoBehaviour
             var stepManager = FindObjectOfType<StepManager>();
             if (stepManager != null)
             {
-                stepManager.InitializeFromGameManager();
-                Debug.Log("PageController: StepManager.InitializeFromGameManager() 已调用");
             }
         }
     }