fix(equipBox): 修正装备弹窗显示层级和位置问题

1. 调整ibox预制体的尺寸和对齐参数适配新布局
2. 修改弹窗挂载层级，避免被其他元素遮挡
3. 修正弹窗位置计算逻辑，适配新的父节点坐标系

assets/resources/gui/element/ibox.prefab

@@ -786,7 +786,7 @@
     },
     "_lpos": {
       "__type__": "cc.Vec3",
-      "x": 2.5,
+      "x": 0,
       "y": 0,
       "z": 0
     },
@@ -827,8 +827,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 715,
-      "height": 120
+      "width": 720,
+      "height": 200
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -900,10 +900,10 @@
     },
     "_alignFlags": 45,
     "_target": null,
-    "_left": 5,
+    "_left": 0,
     "_right": 0,
-    "_top": 0,
-    "_bottom": 0,
+    "_top": 540,
+    "_bottom": 540,
     "_horizontalCenter": 0,
     "_verticalCenter": 0,
     "_isAbsLeft": true,
@@ -1079,7 +1079,7 @@
     "_contentSize": {
       "__type__": "cc.Size",
       "width": 720,
-      "height": 120
+      "height": 1280
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",