feat(selection): show gold brick chart below volume in stock detail panel

Add an optional brick_chart series to the selection chart API, computed
from the shared gold-brick formula when strategy=gold_brick, and render
a fourth grid with red/green brick bars between the volume and J grids.

zhixing-web/src/features/selection/components/signal-detail-panel.tsx

@@ -23,7 +23,11 @@ interface SignalDetailPanelProps {
 }
 
 export function SignalDetailPanel({ stock }: SignalDetailPanelProps) {
-  const chartQuery = useSelectionChart(stock?.ts_code, stock?.target_trade_date)
+  const chartQuery = useSelectionChart(
+    stock?.ts_code,
+    stock?.target_trade_date,
+    stock?.strategy,
+  )
 
   if (!stock) {
     return (