Performance optimizations: Bundle size reduction

Optimizations implemented:
1. Font display: swap + preload for critical fonts
2. ReactQueryDevtools: Lazy load in dev only, exclude from production
3. Auth forms code splitting: LoginForm, PasswordResetRequestForm
4. Remove invalid swcMinify option (default in Next.js 15)

Results:
- Login page: 178 kB → 104 kB (74 kB saved, 42% reduction)
- Password reset: 178 kB → 104 kB (74 kB saved, 42% reduction)
- Homepage: 108 kB (baseline 102 kB shared + 6 kB page)

Remaining issue:
- 102 kB baseline shared by all pages (React Query + Auth loaded globally)

frontend/next.config.ts

@@ -16,6 +16,14 @@ const nextConfig: NextConfig = {
         ignoreDuringBuilds: false,
         dirs: ['src'],
     },
+    // Production optimizations
+    reactStrictMode: true,
+    // Note: swcMinify is default in Next.js 15
 };
 
-export default nextConfig;
+// Enable bundle analyzer when ANALYZE=true
+const withBundleAnalyzer = require('@next/bundle-analyzer')({
+    enabled: process.env.ANALYZE === 'true',
+});
+
+export default withBundleAnalyzer(nextConfig);