fix(console): fix stuck authentication check and add reliable redirect to /console/login

- Add immediate redirection to /console/login when unauthenticated in AdminLayout
- Add timeout (4000ms) with AbortController in adminApi.ts to prevent infinite pending fetch
- Provide explicit sign-in link in layout fallback view

refer_landing_page/lib/adminApi.ts

@@ -153,23 +153,32 @@ async function request<T>(
 
   const baseUrl = getAdminApiBaseUrl();
   const url = `${baseUrl}${endpoint}`;
-  const response = await fetch(url, {
-    ...options,
-    headers,
-    cache: "no-store",
-  });
+  
+  const controller = new AbortController();
+  const timeoutId = setTimeout(() => controller.abort(), 4000);
 
-  if (response.status === 204) {
-    return {} as T;
+  try {
+    const response = await fetch(url, {
+      ...options,
+      headers,
+      signal: controller.signal,
+      cache: "no-store",
+    });
+
+    if (response.status === 204) {
+      return {} as T;
+    }
+
+    const json = await response.json().catch(() => ({}));
+    if (!response.ok) {
+      const errorMsg = json?.error?.message || `Request failed with status ${response.status}`;
+      throw new Error(errorMsg);
+    }
+
+    return json.data;
+  } finally {
+    clearTimeout(timeoutId);
   }
-
-  const json = await response.json().catch(() => ({}));
-  if (!response.ok) {
-    const errorMsg = json?.error?.message || `Request failed with status ${response.status}`;
-    throw new Error(errorMsg);
-  }
-
-  return json.data;
 }
 
 // 0. Auth Verification