feat(mobile): integrate community hierarchy API in profile page

- Call getMyCommunityHierarchy() to get parent/child community info
- Display parent community name (defaults to 总部社区 if none)
- Display child communities count and first name

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/mobile-app/lib/features/profile/presentation/pages/profile_page.dart

@@ -295,13 +295,28 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
       debugPrint('[ProfilePage]   市公司授权: ${summary.cityCompany != null}');
       debugPrint('[ProfilePage]   省公司授权: ${summary.provinceCompany != null}');
 
+      // 获取社区层级数据
+      try {
+        final hierarchy = await authorizationService.getMyCommunityHierarchy();
+        if (mounted) {
+          setState(() {
+            _parentCommunity = hierarchy.parentCommunity.communityName;
+            _childCommunity = hierarchy.childCommunityCount > 0
+                ? '${hierarchy.childCommunities.first.communityName}${hierarchy.childCommunityCount > 1 ? " 等${hierarchy.childCommunityCount}个" : ""}'
+                : '--';
+          });
+        }
+        debugPrint('[ProfilePage] 社区层级: 上级=${hierarchy.parentCommunity.communityName}, 下级数量=${hierarchy.childCommunityCount}');
+      } catch (e) {
+        debugPrint('[ProfilePage] 获取社区层级失败: $e');
+        // 失败时保持默认值
+      }
+
       if (mounted) {
         setState(() {
           _community = summary.communityName ?? '--';
           _cityCompany = summary.cityCompanyName ?? '--';
           _provinceCompany = summary.provinceCompanyName ?? '--';
-          // 上级社区和下级社区暂时无法从当前API获取
-          // 后续需要扩展API或从推荐链中计算
 
           // 更新社区考核数据
           if (summary.community != null) {