feat: 更新 homeUrl 方法以支持传递应用 logo，增强 URL 生成逻辑

lib/config/app_config.dart

@@ -17,13 +17,14 @@ class AppConfig {
     return _environmentHosts[currentEnvironment] ?? const [];
   }
 
-  static String homeUrl({String? appName}) {
+  static String homeUrl({String? appName, String? appLogo}) {
     final host = environmentHosts.isNotEmpty
         ? environmentHosts.first
         : 'h5-im.imharry.work';
     return _withShellBranding(
       _normalizeHomeUrl(host),
       appName: appName,
+      appLogo: appLogo,
     );
   }
 
@@ -38,17 +39,31 @@ class AppConfig {
   static String _withShellBranding(
     String url, {
     String? appName,
+    String? appLogo,
   }) {
     final uri = Uri.parse(url);
     final queryParameters = Map<String, String>.from(uri.queryParameters)
       ..['flutter_shell'] = '1'
       ..['shell_cache_bust'] = DateTime.now().millisecondsSinceEpoch.toString();
+    final fragmentParameters = Uri.splitQueryString(uri.fragment);
 
     final trimmedName = (appName ?? AppConfig.appName).trim();
     if (trimmedName.isNotEmpty) {
       queryParameters['shell_app_name'] = trimmedName;
     }
 
-    return uri.replace(queryParameters: queryParameters).toString();
+    final trimmedLogo = (appLogo ?? AppConfig.appLogo).trim();
+    if (trimmedLogo.isNotEmpty) {
+      fragmentParameters['shell_app_logo'] = trimmedLogo;
+    }
+
+    return uri
+        .replace(
+          queryParameters: queryParameters,
+          fragment: fragmentParameters.isEmpty
+              ? null
+              : Uri(queryParameters: fragmentParameters).query,
+        )
+        .toString();
   }
 }

lib/main.dart

@@ -219,6 +219,7 @@ class _H5ShellPageState extends State<H5ShellPage> with WidgetsBindingObserver {
     WidgetsBinding.instance.addObserver(this);
     _homeUrl = AppConfig.homeUrl(
       appName: widget.shellBranding.appName,
+      appLogo: widget.shellBranding.appLogo,
     );
     _controller = _buildController()..loadRequest(Uri.parse(_homeUrl));
   }

test/widget_test.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:im_webview_app/config/app_config.dart';
 import 'package:im_webview_app/main.dart';
 
 void main() {
@@ -9,4 +10,18 @@ void main() {
       isA<Widget>(),
     );
   });
+
+  test('passes shell branding name and logo to the H5 URL', () {
+    const logo = 'data:image/png;base64,abc+/=';
+
+    final uri = Uri.parse(
+      AppConfig.homeUrl(appName: 'Shell Test', appLogo: logo),
+    );
+
+    expect(uri.queryParameters['flutter_shell'], '1');
+    expect(uri.queryParameters['shell_app_name'], 'Shell Test');
+    expect(uri.queryParameters.containsKey('shell_app_logo'), isFalse);
+    expect(uri.toString(), isNot(contains('%25')));
+    expect(Uri.splitQueryString(uri.fragment)['shell_app_logo'], logo);
+  });
 }