fix(pwa): 修复 manifest.json 未被引用导致浏览器无法识别 PWA (#640)

在 index.html 中添加 manifest 引用，并补全 PWA 必需字段

resources/manifest.json

@@ -1,5 +1,11 @@
 {
-  "name": "Alger Music PWA",
+  "name": "Alger Music Player",
+  "short_name": "AlgerMusic",
+  "description": "AlgerMusicPlayer 音乐播放器，支持在线播放、歌词显示、音乐下载等功能。",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#000000",
   "icons": [
     {
       "src": "./icon.png",

src/renderer/index.html

@@ -25,6 +25,7 @@
 
     <meta name="apple-mobile-web-app-capable" content="yes" />
     <meta name="apple-mobile-web-app-status-bar-style" content="black" />
+    <link rel="manifest" href="/manifest.json" />
 
     <!-- 资源预加载 -->
     <link rel="preload" href="./assets/icon/iconfont.css" as="style" />