Get Domain Preview

Read-only preview for a domain before we create the project in our DB.

Backed by GtmProject + GtmSegment (the marketing funnel side). Lets the onboarding wizard show "here's what we know about your company" before the user commits.

404 with {code: "gtm_project_not_found"} when the funnel hasn't generated anything for this domain — the client redirects to the funnel itself (explee.com/auto-gtm/company/{domain}/explore) so the user generates segments and comes back.