feat(portfolio): CSV 导出增加市场分类维度，支持 A股/美股/港股/虚拟币精准识别

app/dashboard/page.tsx

@@ -66,11 +66,24 @@ function exportToCSV(positions: any[]) {
     return str;
   };
 
-  const headers = ["资产名称", "代码", "持仓量", "成本价", "现价", "总市值", "浮动盈亏", "累计盈亏"];
+  const getMarketName = (item: any): string => {
+    if (item.type === 'CRYPTO' || item.assetType === 'CRYPTO') return '虚拟币';
+    const currency = (item.baseCurrency || '').toUpperCase();
+    if (currency === 'USD') return '美股';
+    if (currency === 'HKD') return '港股';
+    if (currency === 'CNY' || currency === 'RMB') return 'A股';
+    const symbol = (item.symbol || '').toLowerCase();
+    if (/^\d{5}$/.test(symbol)) return '港股';
+    if (/^(60|00|30)\d{4}$/.test(symbol) || symbol.startsWith('sh') || symbol.startsWith('sz')) return 'A股';
+    return '其他市场';
+  };
+
+  const headers = ["资产名称", "代码", "市场", "持仓量", "成本价", "现价", "总市值", "浮动盈亏", "累计盈亏"];
 
   const rows = positions.map(item => [
     item.name || item.symbol,
     item.symbol,
+    getMarketName(item),
     item.quantity || '0',
     stripTrailingZeros(new Big(item.avgCostNative || '0').toFixed(2)),
     stripTrailingZeros(item.latestPrice || '0'),