fix(analytics): properly forward client IPs to Rybbit and OpenPanel

- Create new API route /api/rybbit/track to proxy Rybbit tracking requests
- Extract real client IP from Cloudflare headers (cf-connecting-ip)
- Forward X-Forwarded-For and X-Real-IP headers to analytics backends
- Update OpenPanel proxy to also forward client IP
- Update next.config.ts rewrite to use internal API route

This fixes geo-location issues where all traffic appeared to come from
Cloudflare edge locations instead of actual visitor countries.

src/app/[locale]/layout.tsx

@@ -53,7 +53,7 @@ export default async function LocaleLayout({
       <Script
         src="/api/script.js"
         data-site-id={RYBBIT_SITE_ID}
-        strategy="lazyOnload"
+        strategy="afterInteractive"
       />
       <NextIntlClientProvider messages={messages}>
         {children}