The ikas store connection (admin)
GET/api/integrations/ikas
How the tenant's ikas store is connected (doc 81 §8.4): store name,
connect path (oauth platform app or private app), webhook state,
mirror sync progress and the storefront chat widget. Credentials and
tokens are never returned. oauth_available says whether the platform
app is configured, i.e. whether "Connect with ikas" can be offered.