fix: 修复 faqs 和 users 页面缺少默认 return 的问题

frontend/app/agent/faqs/page.tsx

@@ -472,5 +472,13 @@ export default function FAQsPage({ embedded = false }: FAQsPageProps) {
       </Dialog>
     </>
   );
+  }
+
+  return (
+    <ResponsiveLayout
+      main={mainContent}
+      header={headerContent}
+    />
+  );
 }
 

frontend/app/agent/users/page.tsx

@@ -663,5 +663,13 @@ export default function UsersPage({ embedded = false }: UsersPageProps) {
       </Dialog>
     </>
   );
+  }
+
+  return (
+    <ResponsiveLayout
+      main={mainContent}
+      header={headerContent}
+    />
+  );
 }