feat: 双Pass膨胀描边shader替代LineRenderer

- 新增 Custom/OutlineUnlit shader: Pass1膨胀描边(Cull Front)+Pass2内芯填充
- BlueOutline.mat: 蓝色描边+半透蓝填充
- TouchPositionHandler改用MeshRenderer.enabled闪烁
- 球体挂MeshRenderer+Outline材质，0.4s闪烁

Assets/Scripts/Interaction/TouchPositionHandler.cs

@@ -1,8 +1,8 @@
 using UnityEngine;
 
 /// <summary>
-/// 挂在 touchArray 的每个子球体上，点击时把 woman 移动到 womanPointArray 对应位置。
-/// 两个交叉圆环形成球形轮廓闪烁提示。
+/// 挂在 touchArray 子球体上。球体用双Pass膨胀描边shader（Custom/OutlineUnlit），
+/// 闪烁提示用户点击。点击后移动到对应位置并顺序显示下一个。
 /// </summary>
 public class TouchPositionHandler : MonoBehaviour
 {
@@ -10,73 +10,20 @@ public class TouchPositionHandler : MonoBehaviour
     public GameObject womanObject;
     public GameObject nextTouchObject;
 
-    private LineRenderer _ringH; // 水平环
-    private LineRenderer _ringV; // 垂直环
+    private MeshRenderer _meshRenderer;
 
     private void Start()
     {
-        var mr = GetComponent<MeshRenderer>();
-        if (mr != null) mr.enabled = false;
-
-        CreateCrossRings();
-        StartCoroutine(BlinkRings());
+        _meshRenderer = GetComponent<MeshRenderer>();
+        StartCoroutine(BlinkMesh());
     }
 
-    private void CreateCrossRings()
-    {
-        float r = 0.15f;
-        int segs = 32;
-        float yOff = 0.05f;
-        Color blue = new Color(0.2f, 0.5f, 1f);
-
-        // 水平环 —— 世界空间 XZ 平面
-        var hGo = new GameObject("RingH");
-        hGo.transform.SetParent(transform, false);
-        _ringH = hGo.AddComponent<LineRenderer>();
-        SetupRing(_ringH, blue);
-        _ringH.useWorldSpace = true;
-        _ringH.positionCount = segs;
-        Vector3 center = transform.position + Vector3.up * yOff;
-        for (int i = 0; i < segs; i++)
-        {
-            float a = i * 2f * Mathf.PI / segs;
-            _ringH.SetPosition(i, center + new Vector3(Mathf.Cos(a) * r, 0, Mathf.Sin(a) * r));
-        }
-
-        // 垂直环 —— 世界空间 XY 平面（竖起来）
-        var vGo = new GameObject("RingV");
-        vGo.transform.SetParent(transform, false);
-        _ringV = vGo.AddComponent<LineRenderer>();
-        SetupRing(_ringV, blue);
-        _ringV.useWorldSpace = true;
-        _ringV.positionCount = segs;
-        for (int i = 0; i < segs; i++)
-        {
-            float a = i * 2f * Mathf.PI / segs;
-            _ringV.SetPosition(i, center + new Vector3(Mathf.Cos(a) * r, Mathf.Sin(a) * r, 0));
-        }
-
-        Debug.Log($"[TouchPosition] {name}: 交叉蓝环已创建 (r={r})");
-    }
-
-    private void SetupRing(LineRenderer lr, Color c)
-    {
-        lr.loop = true;
-        lr.startWidth = 0.06f;
-        lr.endWidth = 0.06f;
-        lr.material = new Material(Shader.Find("Unlit/Color"));
-        lr.material.color = c;
-        lr.startColor = c;
-        lr.endColor = c;
-    }
-
-    private System.Collections.IEnumerator BlinkRings()
+    private System.Collections.IEnumerator BlinkMesh()
     {
         while (true)
         {
-            bool on = !_ringH.enabled;
-            if (_ringH != null) _ringH.enabled = on;
-            if (_ringV != null) _ringV.enabled = on;
+            if (_meshRenderer != null)
+                _meshRenderer.enabled = !_meshRenderer.enabled;
             yield return new WaitForSeconds(0.4f);
         }
     }
@@ -91,14 +38,9 @@ public class TouchPositionHandler : MonoBehaviour
             womanObject.transform.rotation = targetPosition.rotation;
             Debug.Log($"[TouchPosition] woman 移动到 {targetPosition.name}");
         }
-        else
-        {
-            Debug.LogWarning($"[TouchPosition] {name}: 引用为空");
-        }
 
         StopAllCoroutines();
-        if (_ringH != null) _ringH.enabled = false;
-        if (_ringV != null) _ringV.enabled = false;
+        if (_meshRenderer != null) _meshRenderer.enabled = false;
 
         gameObject.SetActive(false);
         if (nextTouchObject != null)