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/middleware.ts

@@ -32,4 +32,4 @@ export const config = {
   matcher: [
     "/((?!_next/static|_next/image|favicon.ico|icon.png|robots.txt|sitemap.xml).*)",
   ],
-};
+};