将invite.html设置为主页面，更新所有返回主页面的链接

invite.html

@@ -188,7 +188,6 @@
     <div class="action-buttons">
       <button class="btn btn-primary" onclick="generateInviteQR()">重新生成二维码</button>
       <button class="btn btn-primary" onclick="window.location.href='qr-collection.html'">查看二维码合集</button>
-      <button class="btn btn-secondary" onclick="window.location.href='certificate.html'">返回主页面</button>
     </div>
     
     <div class="footer">

qr-collection.html

@@ -257,7 +257,7 @@
     
     <div class="action-buttons">
       <button class="btn btn-primary" onclick="window.location.href='invite.html'">生成邀请二维码</button>
-      <button class="btn btn-secondary" onclick="window.location.href='certificate.html'">返回主页面</button>
+      <button class="btn btn-secondary" onclick="window.location.href='invite.html'">返回主页面</button>
     </div>
     
     <div class="footer">

server.js

@@ -496,7 +496,7 @@ const server = http.createServer(async (req, res) => {
   // 解析请求路径，移除查询参数
   let filePath = '.' + req.url.split('?')[0];
   if (filePath === './') {
-    filePath = './certificate.html';
+    filePath = './invite.html';
   }
 
   // 获取文件扩展名