refactor(gui): 重构进度条和背景资源结构

- 删除旧的bar.prefab文件
- 新增多种颜色的进度条prefab文件(bar, barb, barg, barr, barw, bary)
- 调整btn_yellow.prefab的尺寸和位置
- 简化bg_info.prefab的结构，移除边框和角落装饰
- 更新相关图片资源引用

assets/resources/gui/uis/btns/btn_yellow.prefab

@@ -108,8 +108,8 @@
     },
     "_lscale": {
       "__type__": "cc.Vec3",
-      "x": 5,
-      "y": 5,
+      "x": 1,
+      "y": 1,
       "z": 1
     },
     "_mobility": 0,
@@ -136,8 +136,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 40,
-      "height": 20.4
+      "width": 200,
+      "height": 102
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -173,7 +173,7 @@
       "a": 255
     },
     "_spriteFrame": {
-      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a@f58dc",
+      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a@e556e",
       "__expectedType__": "cc.SpriteFrame"
     },
     "_type": 1,
@@ -271,7 +271,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 0,
+      "y": 6,
       "z": 0
     },
     "_lrot": {
@@ -477,22 +477,10 @@
       "b": 124,
       "a": 255
     },
-    "_normalSprite": {
-      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a@f8ede",
-      "__expectedType__": "cc.SpriteFrame"
-    },
-    "_hoverSprite": {
-      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a@3ca22",
-      "__expectedType__": "cc.SpriteFrame"
-    },
-    "_pressedSprite": {
-      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a@f2129",
-      "__expectedType__": "cc.SpriteFrame"
-    },
-    "_disabledSprite": {
-      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a@f2129",
-      "__expectedType__": "cc.SpriteFrame"
-    },
+    "_normalSprite": null,
+    "_hoverSprite": null,
+    "_pressedSprite": null,
+    "_disabledSprite": null,
     "_duration": 0.1,
     "_zoomScale": 0.8,
     "_target": {