Astro runtime adapter pro Effect

Hotovo

Astro endpointy potrebovaly entrypoint do Effect. Runtime.ts ma module-level ManagedRuntime (cached per Worker isolate) co builds Layer z DbLive + SessionLive + provideD1(env.DB) z cloudflare:workers. Export runAuth() a runAuthToResponse() (druha mapuje AuthError tagy na 400/401/409/500 Response).