feat: 添加登录页面 URL 检测功能；更新 H5ShellPage 状态管理以支持路由变化

lib/config/app_config.dart

@@ -83,6 +83,19 @@ class AppConfig {
     return url;
   }
 
+  static bool isLoginPageUrl(String? url) {
+    if (url == null || url.isEmpty) {
+      return false;
+    }
+
+    final uri = Uri.tryParse(url);
+    if (uri == null) {
+      return false;
+    }
+
+    return _isLoginPath(uri.path) || _isLoginPath(uri.fragment);
+  }
+
   static int? lineIndexForUrl(String url) {
     final uri = Uri.tryParse(url);
     if (uri == null) {
@@ -123,6 +136,21 @@ class AppConfig {
     return index;
   }
 
+  static bool _isLoginPath(String path) {
+    final normalized = path.trim();
+    if (normalized.isEmpty) {
+      return false;
+    }
+
+    final pathOnly = normalized.split('?').first.split('#').first;
+    final segments = pathOnly.split('/').where((segment) => segment.isNotEmpty);
+    if (segments.isEmpty) {
+      return false;
+    }
+
+    return segments.last == 'login';
+  }
+
   static bool _isSameLine(Uri lineUri, Uri uri) {
     if (lineUri.host.toLowerCase() != uri.host.toLowerCase()) {
       return false;