fix(gui): 调整角色控制器预制体的子节点位置和缩放

修正子节点_y轴位置偏移，使其更符合布局预期。同时将缩放从2倍调整为2.5倍，保持视觉一致性。调整底部边距以匹配新的缩放比例。

assets/resources/gui/role_controller.prefab

@@ -16106,7 +16106,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -377.937,
+      "y": -370.375,
       "z": 0
     },
     "_lrot": {
@@ -16118,8 +16118,8 @@
     },
     "_lscale": {
       "__type__": "cc.Vec3",
-      "x": -2,
+      "x": -2.5,
-      "y": 2,
+      "y": 2.5,
       "z": 1
     },
     "_mobility": 0,
@@ -16254,7 +16254,7 @@
     "_left": 295,
     "_right": 0,
     "_top": 0,
-    "_bottom": 134.063,
+    "_bottom": 109.62500000000006,
     "_horizontalCenter": 0,
     "_verticalCenter": -395.126,
     "_isAbsLeft": true,