Remove all obsolete authentication, settings, admin, and demo-related components and pages

- Eliminated redundant components, pages, and layouts related to authentication (`login`, `register`, `password-reset`, etc.), user settings, admin, and demos.
- Simplified the frontend structure by removing unused dynamic imports, forms, and test code.
- Refactored configurations and metadata imports to exclude references to removed features.
- Streamlined the project for future development and improved maintainability by discarding legacy and unused code.

frontend/src/app/[locale]/(auth)/layout.tsx

@@ -0,0 +1,10 @@
+import type { Metadata } from 'next';
+import { AuthLayoutClient } from '@/components/auth/AuthLayoutClient';
+
+export const metadata: Metadata = {
+  title: 'Authentication',
+};
+
+export default function AuthLayout({ children }: { children: React.ReactNode }) {
+  return <AuthLayoutClient>{children}</AuthLayoutClient>;
+}

frontend/src/app/[locale]/(auth)/login/page.tsx

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+import dynamic from 'next/dynamic';
+
+// Code-split LoginForm - heavy with react-hook-form + validation
+const LoginForm = dynamic(
+  /* istanbul ignore next - Next.js dynamic import, tested via component */
+  () => import('@/components/auth/LoginForm').then((mod) => ({ default: mod.LoginForm })),
+  {
+    loading: () => (
+      <div className="space-y-4">
+        <div className="animate-pulse h-10 bg-muted rounded" />
+        <div className="animate-pulse h-10 bg-muted rounded" />
+        <div className="animate-pulse h-10 bg-primary/20 rounded" />
+      </div>
+    ),
+  }
+);
+
+export default function LoginPage() {
+  return (
+    <div className="space-y-6">
+      <div className="text-center">
+        <h2 className="text-3xl font-bold tracking-tight">Sign in to your account</h2>
+        <p className="mt-2 text-sm text-muted-foreground">
+          Access your dashboard and manage your account
+        </p>
+      </div>
+
+      <LoginForm showRegisterLink showPasswordResetLink />
+    </div>
+  );
+}

frontend/src/app/[locale]/(auth)/password-reset/confirm/PasswordResetConfirmContent.tsx

@@ -0,0 +1,93 @@
+/**
+ * Password Reset Confirm Content Component
+ * Wrapped in Suspense boundary to handle useSearchParams()
+ */
+
+'use client';
+
+import { useSearchParams } from 'next/navigation';
+import { useRouter } from '@/lib/i18n/routing';
+import { useEffect, useRef } from 'react';
+import dynamic from 'next/dynamic';
+import { Alert } from '@/components/ui/alert';
+import { Link } from '@/lib/i18n/routing';
+
+// Code-split PasswordResetConfirmForm (319 lines)
+const PasswordResetConfirmForm = dynamic(
+  /* istanbul ignore next - Next.js dynamic import, tested via component */
+  () =>
+    import('@/components/auth/PasswordResetConfirmForm').then((mod) => ({
+      default: mod.PasswordResetConfirmForm,
+    })),
+  {
+    loading: () => (
+      <div className="space-y-4">
+        <div className="animate-pulse h-10 bg-muted rounded" />
+        <div className="animate-pulse h-10 bg-muted rounded" />
+      </div>
+    ),
+  }
+);
+
+export default function PasswordResetConfirmContent() {
+  const searchParams = useSearchParams();
+  const router = useRouter();
+  const token = searchParams.get('token');
+  const timeoutRef = useRef<NodeJS.Timeout | null>(null);
+
+  // Cleanup timeout on unmount
+  useEffect(() => {
+    return () => {
+      if (timeoutRef.current) {
+        clearTimeout(timeoutRef.current);
+      }
+    };
+  }, []);
+
+  // Handle successful password reset
+  const handleSuccess = () => {
+    // Wait 3 seconds then redirect to login
+    timeoutRef.current = setTimeout(() => {
+      router.push('/login');
+    }, 3000);
+  };
+
+  // If no token in URL, show error
+  if (!token) {
+    return (
+      <div className="space-y-6">
+        <div className="text-center">
+          <h2 className="text-3xl font-bold tracking-tight">Invalid Reset Link</h2>
+        </div>
+
+        <Alert variant="destructive">
+          <p className="text-sm">
+            This password reset link is invalid or has expired. Please request a new password reset.
+          </p>
+        </Alert>
+
+        <div className="text-center">
+          <Link
+            href="/password-reset"
+            className="text-sm text-primary underline-offset-4 hover:underline font-medium"
+          >
+            Request new reset link
+          </Link>
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
+      <div className="text-center">
+        <h2 className="text-3xl font-bold tracking-tight">Set new password</h2>
+        <p className="mt-2 text-sm text-muted-foreground">
+          Choose a strong password for your account
+        </p>
+      </div>
+
+      <PasswordResetConfirmForm token={token} onSuccess={handleSuccess} showLoginLink />
+    </div>
+  );
+}

frontend/src/app/[locale]/(auth)/password-reset/confirm/page.tsx

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+/**
+ * Password Reset Confirm Page
+ * Users set a new password using the token from their email
+ */
+
+import { Suspense } from 'react';
+import PasswordResetConfirmContent from './PasswordResetConfirmContent';
+
+export default function PasswordResetConfirmPage() {
+  return (
+    <Suspense
+      fallback={
+        <div className="space-y-6">
+          <div className="text-center">
+            <h2 className="text-3xl font-bold tracking-tight">Set new password</h2>
+            <p className="mt-2 text-sm text-muted-foreground">Loading...</p>
+          </div>
+        </div>
+      }
+    >
+      <PasswordResetConfirmContent />
+    </Suspense>
+  );
+}

frontend/src/app/[locale]/(auth)/password-reset/page.tsx

@@ -0,0 +1,38 @@
+/**
+ * Password Reset Request Page
+ * Users enter their email to receive reset instructions
+ */
+
+import dynamic from 'next/dynamic';
+
+// Code-split PasswordResetRequestForm
+const PasswordResetRequestForm = dynamic(
+  /* istanbul ignore next - Next.js dynamic import, tested via component */
+  () =>
+    import('@/components/auth/PasswordResetRequestForm').then((mod) => ({
+      default: mod.PasswordResetRequestForm,
+    })),
+  {
+    loading: () => (
+      <div className="space-y-4">
+        <div className="animate-pulse h-10 bg-muted rounded" />
+        <div className="animate-pulse h-10 bg-primary/20 rounded" />
+      </div>
+    ),
+  }
+);
+
+export default function PasswordResetPage() {
+  return (
+    <div className="space-y-6">
+      <div className="text-center">
+        <h2 className="text-3xl font-bold tracking-tight">Reset your password</h2>
+        <p className="mt-2 text-muted-foreground">
+          We&apos;ll send you an email with instructions to reset your password
+        </p>
+      </div>
+
+      <PasswordResetRequestForm showLoginLink />
+    </div>
+  );
+}

frontend/src/app/[locale]/(auth)/register/page.tsx

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+import dynamic from 'next/dynamic';
+
+// Code-split RegisterForm (313 lines)
+const RegisterForm = dynamic(
+  /* istanbul ignore next - Next.js dynamic import, tested via component */
+  () => import('@/components/auth/RegisterForm').then((mod) => ({ default: mod.RegisterForm })),
+  {
+    loading: () => (
+      <div className="space-y-4">
+        <div className="animate-pulse h-10 bg-muted rounded" />
+        <div className="animate-pulse h-10 bg-muted rounded" />
+        <div className="animate-pulse h-10 bg-muted rounded" />
+      </div>
+    ),
+  }
+);
+
+export default function RegisterPage() {
+  return (
+    <div className="space-y-6">
+      <div className="text-center">
+        <h2 className="text-3xl font-bold tracking-tight">Create your account</h2>
+        <p className="mt-2 text-sm text-muted-foreground">
+          Get started with your free account today
+        </p>
+      </div>
+
+      <RegisterForm showLoginLink />
+    </div>
+  );
+}