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/api/selection.api.ts

@@ -13,11 +13,13 @@ import {
 export function getSelectionChart(
   tsCode: string,
   targetTradeDate: string,
+  strategy?: SelectionStrategy,
   signal?: AbortSignal,
 ) {
   const params = new URLSearchParams({
     target_trade_date: targetTradeDate,
   })
+  if (strategy) params.set("strategy", strategy)
   return requestJson<SelectionChart>(
     `/api/v1/selection/stocks/${encodeURIComponent(tsCode)}/chart?${params.toString()}`,
     { signal },