feat(i18n): add Italian and Spanish to locale config and middleware

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/i18n/config.ts

@@ -1,4 +1,4 @@
-export const locales = ['en', 'fr'] as const
+export const locales = ['en', 'fr', 'it', 'es'] as const
 export const defaultLocale = 'en' as const
 
 export type Locale = (typeof locales)[number]

src/middleware.ts

@@ -4,5 +4,5 @@ import { routing } from './i18n/routing'
 export default createMiddleware(routing)
 
 export const config = {
-  matcher: ['/', '/(fr|en)/:path*', '/((?!api|_next|admin|media|fonts|images|favicon.ico).*)'],
+  matcher: ['/', '/(fr|en|it|es)/:path*', '/((?!api|_next|admin|media|fonts|images|favicon.ico).*)'],
 }