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>
   )

frontend/src/components/Analytics.tsx

@@ -0,0 +1,45 @@
+'use client';
+
+import { useEffect } from 'react';
+import Script from 'next/script';
+
+interface AnalyticsProps {
+  umamiWebsiteId?: string;
+  umamiSrc?: string;
+  clarityId?: string;
+}
+
+export default function Analytics({
+  umamiWebsiteId = process.env.NEXT_PUBLIC_UMAMI_WEBSITE_ID,
+  umamiSrc = process.env.NEXT_PUBLIC_UMAMI_SRC || 'https://analytics.grantech.kr/script.js',
+  clarityId = process.env.NEXT_PUBLIC_CLARITY_ID,
+}: AnalyticsProps) {
+  // Microsoft Clarity initialization
+  useEffect(() => {
+    if (clarityId && typeof window !== 'undefined') {
+      (function (c: Window & { clarity?: Function }, l: Document, a: string, r: string, i: string) {
+        (c as any)[a] = (c as any)[a] || function (...args: any[]) {
+          ((c as any)[a].q = (c as any)[a].q || []).push(args);
+        };
+        const t = l.createElement(r) as HTMLScriptElement;
+        t.async = true;
+        t.src = 'https://www.clarity.ms/tag/' + i;
+        const y = l.getElementsByTagName(r)[0];
+        y.parentNode?.insertBefore(t, y);
+      })(window, document, 'clarity', 'script', clarityId);
+    }
+  }, [clarityId]);
+
+  return (
+    <>
+      {/* Umami Analytics */}
+      {umamiWebsiteId && (
+        <Script
+          src={umamiSrc}
+          data-website-id={umamiWebsiteId}
+          strategy="afterInteractive"
+        />
+      )}
+    </>
+  );
+}