feat(selection): show stock industry and concept boards in detail panel

Add point-in-time stock membership lookup to the sector radar module
(GET /sector-radar/stocks/{ts_code}/membership) reading the existing
dc_index/dc_member snapshots, and surface industries plus concept chips
in the selection signal detail panel with graceful no-data hiding.

zhixing-web/src/features/sector-radar/api/sector-radar.query.ts

@@ -4,7 +4,7 @@ import {
   type InfiniteData,
 } from "@tanstack/react-query"
 
-import { getSectorRadarDates, getSectorRadarRankings } from "./sector-radar.api"
+import { getSectorRadarDates, getSectorRadarRankings, getStockSectorMembership } from "./sector-radar.api"
 import type {
   RadarRankingsQuery,
   RadarRankingsResponse,
@@ -12,6 +12,34 @@ import type {
 
 export const sectorRadarDatesQueryKey = ["sectorRadar", "dates"] as const
 
+export const stockSectorMembershipQueryKey = (
+  tsCode?: string,
+  tradeDate?: string,
+) =>
+  [
+    "sectorRadar",
+    "stockMembership",
+    tsCode ?? "none",
+    tradeDate ?? "none",
+  ] as const
+
+/**
+ * Read one stock's point-in-time industries and concepts for a detail view.
+ *
+ * Disabled until both the stock code and target trade date are known; the
+ * query stays cached per code-date pair so switching selections refetches
+ * only unseen pairs.
+ */
+export function useStockSectorMembership(tsCode?: string, tradeDate?: string) {
+  return useQuery({
+    enabled: Boolean(tsCode && tradeDate),
+    queryFn: ({ signal }) =>
+      getStockSectorMembership(tsCode ?? "", tradeDate ?? "", signal),
+    queryKey: stockSectorMembershipQueryKey(tsCode, tradeDate),
+    staleTime: 5 * 60 * 1000,
+  })
+}
+
 export const sectorRadarRankingsQueryKey = (query: RadarRankingsQuery) =>
   [
     "sectorRadar",