feat: add i18n middleware for cloudflare compatibility

middleware.ts

@@ -0,0 +1,21 @@
+import { NextResponse } from 'next/server'
+import type { NextRequest } from 'next/server'
+
+const PUBLIC_FILE = /\.(.*)$/
+
+export function middleware(req: NextRequest) {
+  if (
+    req.nextUrl.pathname.startsWith('/_next') ||
+    req.nextUrl.pathname.includes('/api/') ||
+    PUBLIC_FILE.test(req.nextUrl.pathname)
+  ) {
+    return
+  }
+
+  if (req.nextUrl.locale === 'default') {
+    const locale = req.cookies.get('NEXT_LOCALE')?.value || 'en'
+    return NextResponse.redirect(
+      new URL(`/${locale}${req.nextUrl.pathname}${req.nextUrl.search}`, req.url)
+    )
+  }
+}