feat: 添加 JavaScript 通道以处理来自 WebView 的消息

lib/main.dart

@@ -169,6 +169,10 @@ class _H5ShellPageState extends State<H5ShellPage> with WidgetsBindingObserver {
       },
     )
       ..setJavaScriptMode(JavaScriptMode.unrestricted)
+      ..addJavaScriptChannel(
+        'OpenIMFlutterShell',
+        onMessageReceived: _handleShellBridgeMessage,
+      )
       ..setBackgroundColor(_shellBackground)
       ..setNavigationDelegate(
         NavigationDelegate(
@@ -234,6 +238,22 @@ class _H5ShellPageState extends State<H5ShellPage> with WidgetsBindingObserver {
     return controller;
   }
 
+  void _handleShellBridgeMessage(JavaScriptMessage message) {
+    String? type;
+    try {
+      final decoded = jsonDecode(message.message);
+      if (decoded is Map<String, dynamic>) {
+        type = decoded['type'] as String?;
+      }
+    } catch (_) {
+      type = message.message;
+    }
+
+    if (type == 'openAppSettings') {
+      unawaited(openAppSettings());
+    }
+  }
+
   void _showTransientShellCover() {
     _shellCoverTimer?.cancel();
     if (mounted) {