fix(mobile-app): refresh avatar on profile page after upload

Add _hasChanges flag to track changes and pass result when navigating back

🤖 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/edit_profile_page.dart

@@ -43,6 +43,9 @@ class _EditProfilePageState extends ConsumerState<EditProfilePage> {
   // 是否正在上传头像
   bool _isUploadingAvatar = false;
 
+  // 是否有数据变更（用于返回时通知上一页刷新）
+  bool _hasChanges = false;
+
   @override
   void initState() {
     super.initState();
@@ -76,7 +79,7 @@ class _EditProfilePageState extends ConsumerState<EditProfilePage> {
 
   /// 返回上一页
   void _goBack() {
-    context.pop();
+    context.pop(_hasChanges);
   }
 
   /// 显示头像选择底部弹窗
@@ -167,6 +170,7 @@ class _EditProfilePageState extends ConsumerState<EditProfilePage> {
           _avatarUrl = newAvatarUrl;
           _selectedImageFile = null; // 清除本地文件引用
           _isUploadingAvatar = false;
+          _hasChanges = true; // 标记有变更
         });
 
         ScaffoldMessenger.of(context).showSnackBar(