chore: preserve frontend concept lab

frontend/src/components/app/AppReferenceCard.tsx

@@ -0,0 +1,30 @@
+import { Badge } from '@/components/ui/badge'
+
+const sourceLabels: Record<string, string> = {
+  knowledge_item: '知识条目',
+  solution: '解决方案',
+  ticket: '历史工单',
+  document: '文档'
+}
+
+type AppReferenceCardProps = {
+  title: string
+  sourceType: string
+  content: string
+  score: number
+  sourceLabel?: string
+}
+
+export function AppReferenceCard({ title, sourceType, content, score, sourceLabel }: AppReferenceCardProps) {
+  return (
+    <article className="grid gap-2 rounded-md border border-border bg-background p-3">
+      <div className="flex flex-wrap items-center gap-2">
+        <p className="font-medium text-foreground">{title}</p>
+        <Badge variant="secondary">{sourceLabels[sourceType] ?? sourceType}</Badge>
+        <Badge variant="outline">匹配度 {Math.round(score * 100)}%</Badge>
+      </div>
+      <p className="line-clamp-4 whitespace-pre-line text-sm leading-6 text-muted-foreground">{content}</p>
+      {sourceLabel ? <p className="text-xs text-muted-foreground">来源：{sourceLabel}</p> : null}
+    </article>
+  )
+}