Strengthen expired subscription gate

frontend/components/dashboard/scan-terminal/__tests__/productAccessRequired.test.ts

@@ -20,6 +20,10 @@ export function runTests() {
     source.indexOf("function UnauthenticatedGate"),
     source.indexOf("export function ProductAccessRequired"),
   );
+  const subscriptionGate = source.slice(
+    source.indexOf("function SubscriptionGate"),
+    source.indexOf("// ─── Layer 1 fallback"),
+  );
 
   const accessCard = unauthenticatedGate.slice(
     unauthenticatedGate.indexOf('<section className="grid flex-1'),
@@ -37,4 +41,18 @@ export function runTests() {
       accessCard.includes('href="/"'),
     "signed-out terminal gate must keep hard navigation targets for login, signup, and product overview",
   );
+  assert(
+    subscriptionGate.includes("订阅已过期") &&
+      subscriptionGate.includes("终端访问已暂停") &&
+      subscriptionGate.includes("已有付款但未恢复") &&
+      subscriptionGate.includes("刷新权限") &&
+      subscriptionGate.includes("账户中心") &&
+      source.includes("续费并恢复访问"),
+    "authenticated expired subscription gate must clearly say access is paused and show renewal/recovery actions",
+  );
+  assert(
+    source.includes("subscriptionExpiresAt") &&
+      source.includes("isExpiredSubscription"),
+    "subscription gate must distinguish expired users from generic inactive accounts when an expiry timestamp is available",
+  );
 }