feat: 添加相机捕获功能，更新 H5ShellPage 以支持媒体播放设置

lib/main.dart

@@ -204,6 +204,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
       unawaited(
         platformController.setOnShowFileSelector(_handleAndroidFileSelection),
       );
+      unawaited(platformController.setMediaPlaybackRequiresUserGesture(false));
     }
   }
 
@@ -220,6 +221,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
         {
           'acceptTypes': params.acceptTypes,
           'allowMultiple': params.mode == FileSelectorMode.openMultiple,
+          'capture': params.isCaptureEnabled,
         },
       );
       return result ?? <String>[];