fix(mobile-app): 修复引荐列表展开无法显示更多数据的问题

- 使用实际总数作为limit参数请求API
- 添加调试日志便于排查
- 优化：已加载全部数据时直接展开不重复请求

🤖 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

@@ -431,13 +431,26 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
   Future<void> _expandReferralList() async {
     if (_isLoadingMoreReferrals) return;
 
+    // 如果已经加载过全部数据，直接展开，不重新请求
+    if (_referrals.length >= _totalReferralCount) {
+      debugPrint('[ProfilePage] 数据已加载完整，直接展开');
+      setState(() {
+        _isReferralListExpanded = true;
+      });
+      return;
+    }
+
+    debugPrint('[ProfilePage] 展开引荐列表，当前总数: $_totalReferralCount');
+
     setState(() {
       _isLoadingMoreReferrals = true;
     });
 
     try {
       final referralService = ref.read(referralServiceProvider);
-      final response = await referralService.getDirectReferrals(limit: 200);
+      final response = await referralService.getDirectReferrals(limit: _totalReferralCount);
+
+      debugPrint('[ProfilePage] 加载到 ${response.referrals.length} 条引荐记录');
 
       if (mounted) {
         setState(() {