feat: 对齐常驻商城与七鱼客服交互

- 同步商城 H5 登录态与原生 token
- 完善商城/原生 tab 切换、动画及返回交互
- 修复七鱼客服键盘避让和状态栏恢复
- 调整开屏跳过按钮与登录入口交互

test/features/web/web_navigation_policy_test.dart

@@ -0,0 +1,32 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jinzhi_flutter_app/features/web/application/web_navigation_policy.dart';
+
+void main() {
+  test('external handoff matches the resident mall policy', () {
+    expect(
+      shouldOpenWebUrlExternally('https://example.com/download?out=1'),
+      isTrue,
+    );
+    expect(shouldOpenWebUrlExternally('https://example.com/order/1'), isFalse);
+    expect(shouldOpenWebUrlExternally('tel:4000450268'), isTrue);
+  });
+
+  test('telephone handoff removes H5 parameters', () {
+    expect(
+      sanitizeSystemCommunicationUri(Uri.parse('tel:4000450268?out=1')),
+      Uri.parse('tel:4000450268'),
+    );
+    expect(
+      sanitizeSystemCommunicationUri(
+        Uri.parse('tel:4000450268&campaign=mall&out=1'),
+      ),
+      Uri.parse('tel:4000450268'),
+    );
+  });
+
+  test('trusts only exact Qiyu domains and subdomains', () {
+    expect(isTrustedQiyuUrl('https://qiyukf.com/client'), isTrue);
+    expect(isTrustedQiyuUrl('https://service.qiyukf.cn/client'), isTrue);
+    expect(isTrustedQiyuUrl('https://qiyukf.com.evil.example/client'), isFalse);
+  });
+}