design: 顶栏「数据平台」字号字重加大(text-sm + font-medium)

apps/web/src/layout/AppLayout.tsx

@@ -45,7 +45,7 @@ export function AppLayout({ children }: Props) {
           HS <span className="text-primary">Data</span>
         </span>
         <span className="h-4 w-px bg-border" />
-        <span className="text-xs text-muted-foreground">数据平台</span>
+        <span className="text-sm font-medium text-muted-foreground">数据平台</span>
         <div className="ml-auto flex items-center gap-2">
           <span className="flex items-center gap-1.5 text-xs text-muted-foreground">
             <span className="size-1.5 rounded-full bg-primary" />