perf(PledgePanel): 添加 useMemo 缓存图表配置

- 使用 useMemo 缓存 getPledgeDarkGoldOption 计算结果
- 避免每次渲染重新计算图表配置

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

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

src/views/Company/components/MarketDataView/components/panels/PledgePanel.tsx

@@ -1,7 +1,7 @@
 // src/views/Company/components/MarketDataView/components/panels/PledgePanel.tsx
 // 股权质押面板 - 黑金主题
 
-import React, { memo } from 'react';
+import React, { memo, useMemo } from 'react';
 import {
   Box,
   Text,
@@ -28,6 +28,12 @@ export interface PledgePanelProps {
 }
 
 const PledgePanel: React.FC<PledgePanelProps> = ({ pledgeData }) => {
+  // 缓存图表配置
+  const chartOption = useMemo(() => {
+    if (pledgeData.length === 0) return {};
+    return getPledgeDarkGoldOption(pledgeData);
+  }, [pledgeData]);
+
   return (
     <VStack spacing={6} align="stretch">
       {/* 图表卡片 */}
@@ -35,7 +41,7 @@ const PledgePanel: React.FC<PledgePanelProps> = ({ pledgeData }) => {
         {pledgeData.length > 0 && (
           <Box h="400px">
             <ECharts
-              option={getPledgeDarkGoldOption(pledgeData)}
+              option={chartOption}
               style={{ height: '100%', width: '100%' }}
               theme="dark"
             />