fix: allow partner portal SSR to reach admin_api (/me/) for impersonation

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>

CHANGELOG.md

@@ -5,6 +5,16 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), version
 
 ---
 
+## [1.14.2] — 2026-04-22
+
+### Fixed
+- **Admin "Login as Partner" impersonation now completes into `/dashboard`** instead of bouncing back to `/login?error=ImpersonationFailed`. Two linked issues:
+  - **`ALLOWED_HOSTS`** (`eventify/settings.py`) — partner portal's server-side `authorize()` (Next.js) calls `${BACKEND_API_URL}/api/v1/auth/me/` with `BACKEND_API_URL=http://eventify-backend:8000`, so the HTTP `Host` header was `eventify-backend` — not in the Django allowlist. `SecurityMiddleware` rejected with HTTP 400 DisallowedHost, `authorize()` returned null, `signIn()` failed, and the `/impersonate` page redirected to the login error. Added `partner.eventifyplus.com`, `eventify-backend`, and `eventify-django` to `ALLOWED_HOSTS`. Same Host issue was silently breaking regular partner password login too — fixed as a side effect.
+  - **`UserSerializer` missing `partner` field** (`admin_api/serializers.py`) — `MeView` returned `/api/v1/auth/me/` payload with no `partner` key, so the partner portal's `auth.ts` set `partnerId: ""` on the NextAuth session. Downstream dashboard queries that filter by `partnerId` would then return empty/403. Added `partner = PrimaryKeyRelatedField(read_only=True)` to the serializer's `fields` list. Payload now includes `"partner": <id>`.
+- Deploy: `docker cp` both files into **both** `eventify-backend` and `eventify-django` containers + `kill -HUP 1` on each (per shared admin_api rule).
+
+---
+
 ## [1.14.1] — 2026-04-22
 
 ### Fixed

admin_api/serializers.py

@@ -5,9 +5,10 @@ User = get_user_model()
 class UserSerializer(serializers.ModelSerializer):
     name = serializers.SerializerMethodField()
     role = serializers.SerializerMethodField()
+    partner = serializers.PrimaryKeyRelatedField(read_only=True)
     class Meta:
         model = User
-        fields = ['id', 'email', 'username', 'name', 'role']
+        fields = ['id', 'email', 'username', 'name', 'role', 'partner']
     def get_name(self, obj):
         return f"{obj.first_name} {obj.last_name}".strip() or obj.username
     def get_role(self, obj):

eventify/settings.py

@@ -18,6 +18,9 @@ ALLOWED_HOSTS = [
     'backend.eventifyplus.com',
     'admin.eventifyplus.com',
     'app.eventifyplus.com',
+    'partner.eventifyplus.com',
+    'eventify-backend',
+    'eventify-django',
     'localhost',
     '127.0.0.1',
 ]