First-party setup flow for connecting a custom domain to a Hollahoop project. When the user pastes a domain and a provider token (Cloudflare to start, then Vercel DNS, Route53, GoDaddy, Namecheap), Hollahoop creates the CNAME / TXT / ALIAS records automatically. For providers without a public API, fall back to a generated step-by-step guide with the exact records to add manually. Includes propagation polling, TLS issuance status, and a reusable verification API so multiple Hollahoop features (project hubs, widget script CDN, support email) can hang off the same domain config. Makes the existing Custom domain for the widget script and Custom domains for public project hubs cards much faster to onboard onto.