refactor(hero): 调整英雄配置与预制体参数

1.  更新多个英雄prefab的位置向量参数
2.  重构兽人/亡灵英雄配置表，调整英雄名称、资源路径，新增/重组英雄配置条目
3.  调整精灵帧meta的shadow配置位置

assets/resources/game/heros/mb1.prefab

@@ -212,8 +212,8 @@
     ],
     "value": {
       "__type__": "cc.Vec3",
-      "x": 0.7,
-      "y": 1.7,
+      "x": 0.25,
+      "y": 0.7,
       "z": 1
     }
   },

assets/resources/game/heros/mb2.prefab

@@ -212,8 +212,8 @@
     ],
     "value": {
       "__type__": "cc.Vec3",
-      "x": 0.7,
-      "y": 1.7,
+      "x": 0.25,
+      "y": 0.7,
       "z": 1
     }
   },

assets/resources/game/heros/mb3.prefab

@@ -212,8 +212,8 @@
     ],
     "value": {
       "__type__": "cc.Vec3",
-      "x": 0.7,
-      "y": 1.7,
+      "x": 0.25,
+      "y": 0.7,
       "z": 1
     }
   },

assets/resources/game/heros/mb4.prefab

@@ -212,8 +212,8 @@
     ],
     "value": {
       "__type__": "cc.Vec3",
-      "x": 0.7,
-      "y": 1.7,
+      "x": 0.25,
+      "y": 0.6,
       "z": 1
     }
   },

assets/resources/game/heros/mb6.prefab

@@ -212,8 +212,8 @@
     ],
     "value": {
       "__type__": "cc.Vec3",
-      "x": 1.2,
-      "y": 1.9,
+      "x": 0.4,
+      "y": 0.9,
       "z": 1
     }
   },