fix(web): restore product navigation coverage

apps/web/src/app/[locale]/demo/page.tsx

@@ -92,15 +92,7 @@ export default function DemoPage({ params }: { params: { locale: string } }) {
   const tMock = useTranslations('mockData')
   const tDryRun = useTranslations('dryRun')
   const locale = params.locale
-
-  // 生產環境保護: 需要 NEXT_PUBLIC_ENABLE_DEMO=true 才能存取
-  if (process.env.NEXT_PUBLIC_ENABLE_DEMO !== 'true') {
-    return (
-      <div className="flex items-center justify-center min-h-screen">
-        <p className="text-muted-foreground">展示頁已在正式環境停用。</p>
-      </div>
-    )
-  }
+  const demoEnabled = process.env.NEXT_PUBLIC_ENABLE_DEMO === 'true'
 
   const [_isCreating, setIsCreating] = useState(false)
   const [createError, setCreateError] = useState<string | null>(null)
@@ -153,6 +145,15 @@ export default function DemoPage({ params }: { params: { locale: string } }) {
     }
   }, [approvalConfigs, tApproval])
 
+  // 生產環境保護: 需要 NEXT_PUBLIC_ENABLE_DEMO=true 才能存取
+  if (!demoEnabled) {
+    return (
+      <div className="flex items-center justify-center min-h-screen">
+        <p className="text-muted-foreground">{t('disabled')}</p>
+      </div>
+    )
+  }
+
   return (
     <AppLayout locale={locale}>
       <div className="max-w-7xl mx-auto space-y-8">