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]/(authenticated)/settings/sessions/page.tsx

@@ -0,0 +1,23 @@
+/**
+ * Session Management Page
+ * View and manage active sessions across all devices
+ */
+
+'use client';
+
+import { SessionsManager } from '@/components/settings';
+
+export default function SessionsPage() {
+  return (
+    <div className="space-y-6">
+      <div>
+        <h2 className="text-2xl font-semibold text-foreground">Active Sessions</h2>
+        <p className="text-muted-foreground mt-1">
+          View and manage devices signed in to your account
+        </p>
+      </div>
+
+      <SessionsManager />
+    </div>
+  );
+}