fix: H5热更新不再document.write避免双重重叠

- localStorage命中时只更新版号+徽章，不重写页面
- 嵌入式按钮始终可见，可持续检查更新

packages/client-android/android/app/src/main/assets/index.html

@@ -45,7 +45,10 @@ function applyUpdate(){
 (function(){
  var b=localStorage.getItem('gca_html'),v=localStorage.getItem('gca_ver');
  if(b&&v&&v!==document.getElementById('ver').innerText){
-  document.open();document.write(b);document.close()
+  // Show badge but don't rewrite page (avoids double-render)
+  var el=document.createElement('span');el.className='badge';el.style.cssText='background:#22c55e;color:#000';
+  el.innerText='CACHED v'+v.replace('0.1.0-dav-android-','');document.querySelector('h1').appendChild(el);
+  document.getElementById('ver').innerText=v
  }
 })();
 </script></body></html>