Instalace Astro 6 + Cloudflare adapteru

pnpm add astro 6.3, @astrojs/cloudflare 13.5, @astrojs/svelte 8.1, svelte 5.55, jose 6.2, marked 18.0. Wrangler bumped 4.58 → 4.90 protože adapter peer dep požaduje ^4.83.