Make imager URL absolute using NEXT_PUBLIC_APP_URL to avoid port issues

.env.example

@@ -11,6 +11,7 @@ DATABASE_CONNECT_TIMEOUT_MS=10000
 # Used by SSO ticket generation ({HOTEL_NAME}-{uuid})
 HOTEL_NAME=Atom
 APP_URL=http://localhost:3000
+# NEXT_PUBLIC_APP_URL=https://yourdomain.com
 AUTH_URL=http://localhost:3000
 
 # NextAuth (>=32 chars) + Laravel APP_KEY (base64:...) for existing 2FA secrets
@@ -39,7 +40,7 @@ RCON_HOST=127.0.0.1
 RCON_PORT=3001
 
 # Public imager URL — overrides the default /imaging relative path.
-# Set to an absolute URL when the proxy runs on a different origin/port.
+# Falls back to NEXT_PUBLIC_APP_URL/imaging when only the app URL is set.
 # NEXT_PUBLIC_IMAGER_URL=https://epicnabbo.nl/imaging
 
 # Optional OAuth (enabled when both id+secret are set)