fix: update music search keyword and test case ID

- Changed the default search keyword in the API documentation from "这么可爱真是抱歉" to "妖精小姐的魔法邀约".
- Updated the test case for fetching song URL to use the correct song ID (from 1969519579 to 2756058128).

public/index.html

@@ -60,7 +60,7 @@
     <section class="block">
       <h2>常用接口</h2>
       <ul class="links">
-        <li><a href="/search?keywords=这么可爱真是抱歉">搜索音乐: <code>GET /search</code></a></li>
+        <li><a href="/search?keywords=妖精小姐的魔法邀约">搜索音乐: <code>GET /search</code></a></li>
         <li><a href="/song/detail?ids=2756058128">获取音乐详情: <code>GET /song/detail</code></a></li>
         <li><a href="/comment/music?id=2756058128&limit=1">获取音乐评论: <code>GET /comment/music</code></a></li>
         <li><a href="/song/url/v1?id=2756058128&level=exhigh">获取音乐播放链接: <code>GET /song/url/v1</code></a></li>
@@ -71,7 +71,7 @@
       <h2>调试部分</h2>
       <pre><code>curl -s {origin}/inner/version
 curl -s {origin}/search?keywords=网易云</code></pre>
-      <p style="margin-top:10px"> · <a href="/api.html">交互式调试</a> · <a href="/qrlogin.html">二维码登录示例</a> · <a href="/unblock_test.html">解灰测试</a></p> · <a href="/audio_match_demo/index.html">听歌识曲 Demo</a></p> · <a href="/unblock_test.html">云盘上传</a></p> · <a href="/playlist_import.html">歌单导入</a></p> · <a href="/eapi_decrypt.html">EAPI 解密</p>
+      <p style="margin-top:10px"> · <a href="/api.html">交互式调试</a> · <a href="/qrlogin.html">二维码登录示例</a> · <a href="/unblock_test.html">解灰测试</a></p> · <a href="/audio_match_demo/index.html">听歌识曲 Demo</a></p> · <a href="/cloud.html">云盘上传</a></p> · <a href="/playlist_import.html">歌单导入</a></p> · <a href="/eapi_decrypt.html">EAPI 解密</p>
     </section>
 
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