Add AUTH_URL to env example

.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
+AUTH_URL=http://localhost:3000
 
 # NextAuth (>=32 chars) + Laravel APP_KEY (base64:...) for existing 2FA secrets
 AUTH_SECRET=