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/components/product/ProductCard.tsx

@@ -38,6 +38,7 @@ export default function ProductCard({ product, index = 0, locale = "sr" }: Produ
               fill
               className="object-cover object-center transition-transform duration-700 ease-out group-hover:scale-105"
               sizes="(max-width: 640px) 100vw, (max-width: 1024px) 50vw, 25vw"
+              loading={index < 4 ? "eager" : "lazy"}
             />
           ) : (
             <div className="absolute inset-0 flex items-center justify-center text-[#999999]">