fix(ui): "已过期 (算力)"改为"已过期 (贡献值)"

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

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

@@ -2185,7 +2185,7 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [
               const Text(
-                '已过期 (算力)',
+                '已过期 (贡献值)',
                 style: TextStyle(
                   fontSize: 14,
                   fontFamily: 'Inter',