feat: Add Analytics component with Umami and Clarity support

- Add Analytics.tsx component for tracking with Umami (self-hosted) and Microsoft Clarity
- Update layout.tsx to include Analytics component
- Environment variables: NEXT_PUBLIC_UMAMI_WEBSITE_ID, NEXT_PUBLIC_CLARITY_ID

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/app/layout.tsx

@@ -2,6 +2,7 @@ import type { Metadata } from 'next'
 import { Inter } from 'next/font/google'
 import './globals.css'
 import ClientLayout from '@/components/ClientLayout'
+import Analytics from '@/components/Analytics'
 
 const inter = Inter({ subsets: ['latin'] })
 
@@ -21,6 +22,7 @@ export default function RootLayout({
         <ClientLayout>
           {children}
         </ClientLayout>
+        <Analytics />
       </body>
     </html>
   )