fix(mobile-app): 签署成功后跳转到"我的"页面

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mobile-app/lib/features/contract_signing/presentation/pages/contract_signing_page.dart

@@ -344,13 +344,8 @@ class _ContractSigningPageState extends ConsumerState<ContractSigningPage> {
               TextButton(
                 onPressed: () {
                   Navigator.of(context).pop(); // 关闭对话框
-                  // 检查是否可以返回上一页
-                  if (context.canPop()) {
-                    context.pop(true);
-                  } else {
-                    // 如果没有上一页，跳转到首页
-                    context.go('/');
-                  }
+                  // 跳转到"我的"页面
+                  context.go('/profile');
                 },
                 child: const Text('完成'),
               ),