feat(游戏): 新增背景音乐资源，添加播放逻辑并优化教程UI

新增主页与战斗场景的背景音乐文件及对应的导入配置
在主页和战斗任务组件中添加循环播放背景音乐的逻辑
调整四个新手教程引导预制体的文字、字体、描边与布局参数

assets/resources/gui/element/guide3.prefab

@@ -402,7 +402,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 0,
+      "y": 248.35000000000002,
       "z": 0
     },
     "_lrot": {
@@ -703,13 +703,13 @@
       "b": 255,
       "a": 255
     },
-    "_string": "点击开始游戏",
+    "_string": "选中卡牌向上滑动，召唤英雄",
     "_horizontalAlign": 1,
     "_verticalAlign": 1,
-    "_actualFontSize": 36,
-    "_fontSize": 35,
+    "_actualFontSize": 41,
+    "_fontSize": 40,
     "_fontFamily": "Arial",
-    "_lineHeight": 40,
+    "_lineHeight": 50,
     "_overflow": 2,
     "_enableWrapText": true,
     "_font": null,
@@ -728,7 +728,7 @@
       "b": 0,
       "a": 255
     },
-    "_outlineWidth": 2,
+    "_outlineWidth": 4,
     "_enableShadow": false,
     "_shadowColor": {
       "__type__": "cc.Color",
@@ -1174,12 +1174,12 @@
     "__prefab": {
       "__id__": 49
     },
-    "_alignFlags": 40,
+    "_alignFlags": 44,
     "_target": null,
     "_left": 0,
     "_right": 0,
     "_top": 590,
-    "_bottom": 590,
+    "_bottom": 788.35,
     "_horizontalCenter": 0,
     "_verticalCenter": 0,
     "_isAbsLeft": true,
@@ -1303,7 +1303,6 @@
       "__id__": 0
     },
     "fileId": "6dh4o/8p1Cy5An1p6o4Bc3",
-    "instance": null,
-    "targetOverrides": null
+    "instance": null
   }
 ]