feat(app): add password auth for settings

ui/app/library/layout.tsx

@@ -5,7 +5,31 @@ export const metadata: Metadata = {
   title: 'Library - Perplexica',
 };
 
-const Layout = ({ children }: { children: React.ReactNode }) => {
+const Layout = async ({ children }: { children: React.ReactNode }) => {
+  const res = await fetch(
+    `${process.env.NEXT_PUBLIC_API_URL}/config/preferences`,
+    {
+      method: 'GET',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    },
+  );
+
+  const data = await res.json();
+
+  const { isLibraryEnabled } = data;
+
+  if (!isLibraryEnabled) {
+    return (
+      <div className="flex flex-row items-center justify-center min-h-screen w-full">
+        <p className="text-lg dark:text-white/70 text-black/70">
+          Library is disabled
+        </p>
+      </div>
+    );
+  }
+
   return <div>{children}</div>;
 };