fix: change_pct 统一按小数存储并前端乘以100展示

frontend/src/components/StockOverview.tsx

@@ -133,7 +133,7 @@ export function StockOverview({ role }: StockOverviewProps) {
         <KpiCard
           icon={<Activity className="h-4 w-4 text-accent" />}
           label="平均涨跌"
-          value={`${avg_change_pct >= 0 ? '+' : ''}${avg_change_pct.toFixed(2)}%`}
+          value={`${avg_change_pct >= 0 ? '+' : ''}${(avg_change_pct * 100).toFixed(2)}%`}
           valueClass={avg_change_pct >= 0 ? 'text-bull' : 'text-bear'}
         />
       </div>
@@ -186,7 +186,7 @@ function IndexCard({ item }: { item: StockRow }) {
         {item.close.toFixed(2)}
       </div>
       <div className={cn('text-xs font-medium', positive ? 'text-bull' : 'text-bear')}>
-        {positive ? '+' : ''}{item.change_pct.toFixed(2)}%
+        {positive ? '+' : ''}{(item.change_pct * 100).toFixed(2)}%
       </div>
     </div>
   )
@@ -209,7 +209,7 @@ function StockList({
           <div className="text-xs text-muted py-2">暂无数据</div>
         ) : (
           rows.map((item, idx) => {
-            const val = valueKey === 'amount' ? (item.amount ?? 0) / 1e8 : item.change_pct
+            const val = valueKey === 'amount' ? (item.amount ?? 0) / 1e8 : item.change_pct * 100
             const isPositive = valueKey === 'amount' ? true : item.change_pct >= 0
             return (
               <div key={item.symbol} className="flex items-center justify-between text-sm py-1">