chore(trading): 暂时屏蔽卖出DST功能和DST余额显示

待功能开放后取消注释即可恢复

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

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

frontend/mobile-app/lib/features/trading/presentation/pages/trading_page.dart

@@ -252,15 +252,16 @@ class _TradingPageState extends ConsumerState<TradingPage> {
                 const SizedBox(height: 24),
                 // 分隔线
                 _buildDivider(),
-                const SizedBox(height: 24),
-                // 卖出DST按钮
-                _buildSellDstButton(),
-                const SizedBox(height: 8),
-                // DST余额显示
-                _buildDstBalance(),
-                const SizedBox(height: 24),
-                // 分隔线
-                _buildDivider(),
+                // TODO: 暂时屏蔽卖出DST功能，待开放后取消注释
+                // const SizedBox(height: 24),
+                // // 卖出DST按钮
+                // _buildSellDstButton(),
+                // const SizedBox(height: 8),
+                // // DST余额显示
+                // _buildDstBalance(),
+                // const SizedBox(height: 24),
+                // // 分隔线
+                // _buildDivider(),
                 const SizedBox(height: 24),
                 // 提取/转动按钮
                 _buildWithdrawButton(),