```

feat(game): 补齐角色预制体的characterDataName字段并优化英雄归位逻辑

- 为第一章和第二章共12个角色预制体补全characterDataName字段，
  包括人类士兵、弓箭手、法师、盾卫、精锐士兵、弓箭猎人、
  狼人、石巨人、蓝色怪物等角色

- 新增useAnchorLeash字段控制英雄锚点牵绳行为，避免英雄
  追击敌人时被推到地图边界外

- 修复UnitBase中stoppingDistance导致的导航问题，英雄归位
  现在采用正常行走而非瞬移方式

- 修正

Assets/Prefabs/第二章/弓箭猎人.prefab

@@ -445,7 +445,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: da330bbd52e2a424dbe6231c018a3c60, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  characterDataName: 
+  characterDataName: "\u5F13\u7BAD\u730E\u4EBAData"
   level: 1
   speed: 5
   detectionRange: 20

Assets/Prefabs/第二章/狼人.prefab

@@ -255,7 +255,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: da330bbd52e2a424dbe6231c018a3c60, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  characterDataName: 
+  characterDataName: "\u72C2\u66B4\u72FC\u4EBAData"
   level: 1
   speed: 5
   detectionRange: 15

Assets/Prefabs/第二章/石巨人.prefab

@@ -265,7 +265,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: da330bbd52e2a424dbe6231c018a3c60, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  characterDataName: 
+  characterDataName: "\u77F3\u5DE8\u4EBAData"
   level: 1
   speed: 5
   detectionRange: 15

Assets/Prefabs/第二章/蓝色怪物.prefab

@@ -244,7 +244,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: da330bbd52e2a424dbe6231c018a3c60, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  characterDataName: 
+  characterDataName: "\u84DD\u8272\u602A\u7269Data"
   level: 1
   speed: 5
   detectionRange: 15