feat: implement authentication layout and pages, including login and registration forms, with validation and API integration

thoughts-frontend/app/(auth)/layout.tsx

@@ -0,0 +1,12 @@
+// app/(auth)/layout.tsx
+export default function AuthLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return (
+    <div className="flex items-center justify-center min-h-screen bg-gray-100">
+      {children}
+    </div>
+  );
+}