fix(ui): 我的页面 '充值 积分 (KAVA / BSC)' → '充值积分'

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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

@@ -2129,7 +2129,7 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
             ),
             child: const Center(
               child: Text(
-                '充值 积分 (KAVA / BSC)',
+                '充值积分',
                 style: TextStyle(
                   fontSize: 16,
                   fontFamily: 'Inter',