refactor(selection): replace concept sector filter with sub-industry

- pin the selection sector vocabulary to industry: the /sectors endpoint
  no longer accepts sector_type, and the port, adapter, and use case all
  resolve counts and member codes with sector_type="industry"
- relabel the results filter to 细分行业 and drop concept-type plumbing
  from the frontend API, query keys, and types
- show only 细分行业 in the signal detail panel; remove the concept-board
  chips and keep the snapshot-date tooltip on the industry line
- update backend and frontend tests to the industry vocabulary and record
  the revised scope in the task PRD

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

@@ -19,8 +19,6 @@ const SelectionChart = lazy(() =>
   })),
 )
 
-const displayedConceptCount = 8
-
 interface SignalDetailPanelProps {
   stock: SelectionStockResult | undefined
 }
@@ -71,16 +69,13 @@ export function SignalDetailPanel({ stock }: SignalDetailPanelProps) {
   ]
 
   const membership =
-    membershipQuery.data?.status === "success" ? membershipQuery.data : undefined
+    membershipQuery.data?.status === "success"
+      ? membershipQuery.data
+      : undefined
   const industries = membership?.industries ?? []
-  const concepts = membership?.concepts ?? []
-  const extraConceptCount = Math.max(
-    0,
-    concepts.length - displayedConceptCount,
-  )
-  const sectorSnapshotTitle =
+  const industrySnapshotTitle =
     membership?.trade_date != null
-      ? `板块成分截至 ${membership.trade_date}`
+      ? `细分行业成分截至 ${membership.trade_date}`
       : undefined
 
   return (
@@ -138,30 +133,13 @@ export function SignalDetailPanel({ stock }: SignalDetailPanelProps) {
           </p>
 
           {industries.length > 0 && (
-            <p className="mt-1 text-xs text-muted-foreground">
-              行业：{industries.map((industry) => industry.name).join("、")}
-            </p>
-          )}
-          {concepts.length > 0 && (
-            <div
-              className="mt-2 flex flex-wrap items-center gap-1"
-              title={sectorSnapshotTitle}
+            <p
+              className="mt-1 text-xs text-muted-foreground"
+              title={industrySnapshotTitle}
             >
-              <span className="text-xs text-muted-foreground">板块</span>
-              {concepts.slice(0, displayedConceptCount).map((concept) => (
-                <span
-                  className="rounded bg-muted px-1.5 py-0.5 text-xs"
-                  key={concept.code}
-                >
-                  {concept.name}
-                </span>
-              ))}
-              {extraConceptCount > 0 && (
-                <span className="text-xs text-muted-foreground">
-                  等 {concepts.length} 个
-                </span>
-              )}
-            </div>
+              细分行业：
+              {industries.map((industry) => industry.name).join("、")}
+            </p>
           )}
 
           <dl className="mt-3 divide-y divide-border/60 border-y border-border/60 text-xs">