The Stage-1 onboarding path: an invited user opens their emailed link,
sets a password, and Tapir creates their Dex local-password account so
they can log in. Mounted on root OUTSIDE Auth.Middleware — the visitor
has no Dex session yet; the token in the path is the capability.
handleInviteForm previews the token (no consume) and shows the form, or
a clear "expired / already used" page. handleInviteSubmit validates the
password BEFORE consuming the token (a typo is retryable), then claims
the invite exactly once, bcrypt-hashes (cost 12), and creates the Dex
account — mapping ErrPasswordExists -> "log in instead" and ErrForbidden
-> "contact the administrator". Off-cluster (App.Dex nil) it degrades to
a "deployed-only" message without burning the token. On success it sets
an account_created flash and redirects to /auth/login.
Welcome sub-text now states access is invite-only. Handlers depend on
narrow ports (InvitationStore, DexPasswordCreator) so tests use fakes;
cmdServe wires the store + an in-cluster dex.PasswordClient.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
mathiasandClaude Opus 4.8
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