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/music/BATTLE.wav.meta

@@ -0,0 +1,14 @@
+{
+  "ver": "1.0.0",
+  "importer": "audio-clip",
+  "imported": true,
+  "uuid": "7077f9ac-0d7f-49b2-b1fc-258f48ebcb92",
+  "files": [
+    ".json",
+    ".wav"
+  ],
+  "subMetas": {},
+  "userData": {
+    "downloadMode": 0
+  }
+}

assets/resources/music/home.wav.meta

@@ -0,0 +1,14 @@
+{
+  "ver": "1.0.0",
+  "importer": "audio-clip",
+  "imported": true,
+  "uuid": "70867b0a-df6f-4e16-be5d-761e17533c5b",
+  "files": [
+    ".json",
+    ".wav"
+  ],
+  "subMetas": {},
+  "userData": {
+    "downloadMode": 0
+  }
+}