ALLOWED_HOSTS was missing partner.eventifyplus.com + docker internal
hostnames (eventify-backend, eventify-django). Partner Next.js
server-side authorize() fetch to /api/v1/auth/me/ was rejected with
HTTP 400 DisallowedHost, so admin "Login as Partner" redirected to
/login?error=ImpersonationFailed instead of /dashboard.
Also added `partner` FK to UserSerializer so the /me/ response exposes
the partner id the portal needs to set session.user.partnerId.
Deployed to both eventify-backend and eventify-django containers via
docker cp + HUP.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Sicherhaven
46b391bd51