feat: 音频系统重构 - bg音乐流程修复 + woman语音按点位播放

改动:
1. TouchPositionHandler新增voiceClip字段, 点击时播放对应语音
2. PageController.ShowPage: 首页播放homeBg
3. OnFixationSelected: StopBgMusic()(开场动画开始时停bg)
4. ActivateExperimentObjects: 移除PlayWomanAudioSequence, 保留PlayExperimentBg
5. 新增PlayHomeBg/StopBgMusic/PlayExperimentBg方法
6. 删除_audioManager冗余引用

流程:
首页→homeBg播 → 选固定方式→bg停 → 开场动画→实验bg播
woman语音1→点击point1播, 语音2→point2, 语音3→point3

Assets/Scripts/UI/PageController.cs

@@ -122,7 +122,8 @@ public class PageController : MonoBehaviour
 
         if (_uiManager != null)
             _uiManager.enabled = (page == Page.Experiment);
-
+        // 背景音乐: 首页播 homeBg, 选固定方式时停, 实验启动时播 experimentBg
+        if (page == Page.Home) PlayHomeBg();
         Debug.Log($"PageController（编辑器预览）: 切换到 [{page}]");
     }
 #endif
@@ -140,7 +141,8 @@ public class PageController : MonoBehaviour
         if (_experimentPanel != null) _experimentPanel.SetActive(page == Page.Experiment);
 
         if (_uiManager != null) _uiManager.enabled = (page == Page.Experiment);
-
+        // 背景音乐: 首页播 homeBg, 选固定方式时停, 实验启动时播 experimentBg
+        if (page == Page.Home) PlayHomeBg();
         // 背景音乐控制
         if (page == Page.Home) PlayHomeBg();
         else if (page != Page.Experiment) StopBgMusic();
@@ -261,7 +263,7 @@ public class PageController : MonoBehaviour
         Debug.Log($"PageController: GameManager 已设置 Mode=[{gm.CurrentMode}] Fixation=[{gm.CurrentFixationMethod}]");
 
         // 隐藏所有UI面板，准备播放片头动画
-        HideAllPages();
+        StopBgMusic();        HideAllPages();
 
         // 找到 OpeningFlowController 播放片头动画
         var openingFlow = FindObjectOfType<OpeningFlowController>();
@@ -304,7 +306,6 @@ public class PageController : MonoBehaviour
         Debug.Log("PageController: [ActivateExperimentObjects] 显示实验物件");
 
         PlayExperimentBg();
-        StartCoroutine(PlayWomanAudioSequence());
 
         var allObjects = FindObjectsOfType<GameObject>(true);
         foreach (var go in allObjects)
@@ -375,3 +376,30 @@ public class PageController : MonoBehaviour
     [SerializeField] private AudioClip[] _womanClips;
     private AudioSource _bgAudioSource;
 }
+
+    private void PlayHomeBg()
+    {
+        if (_bgAudioSource == null) _bgAudioSource = gameObject.AddComponent<AudioSource>();
+        _bgAudioSource.loop = true;
+        _bgAudioSource.playOnAwake = false;
+        if (_homeBgClip != null && _bgAudioSource.clip != _homeBgClip)
+        {
+            _bgAudioSource.clip = _homeBgClip;
+            _bgAudioSource.Play();
+            Debug.Log("PageController: 播放首页背景音乐");
+        }
+    }
+
+    private void StopBgMusic()
+    {
+        if (_bgAudioSource != null && _bgAudioSource.isPlaying) { _bgAudioSource.Stop(); Debug.Log("PageController: 停止背景音乐"); }
+    }
+
+    private void PlayExperimentBg()
+    {
+        StopBgMusic();
+        if (_bgAudioSource == null) _bgAudioSource = gameObject.AddComponent<AudioSource>();
+        _bgAudioSource.loop = true;
+        _bgAudioSource.playOnAwake = false;
+        if (_experimentBgClip != null) { _bgAudioSource.clip = _experimentBgClip; _bgAudioSource.Play(); Debug.Log("PageController: 播放实验背景音乐"); }
+    }