Members (and pre-registrants) hitting wiki.ghostguild.org were getting bounced
to /coming-soon with a "Pre-Register" link, even when the OIDC flow was
working correctly.
- Allowlist /auth/oidc-error, /auth/logout-confirm, /auth/logout-success,
and /verify in the coming-soon middleware so OIDC errors and main-site
magic links stop redirecting to the pre-register page.
- Raise OIDC Interaction TTL from 10m to 15m so it outlives the magic-link
JWT and legitimate members don't hit expired-interaction errors when they
click the email a few minutes late.
- Differentiate the "email isn't a registered member" response on the wiki
login route and show a dedicated "Not a member yet" state with a
pre-register link and contact email, instead of the misleading
"Check your inbox" that silently failed.