{"message":"Miniapp Backend API","version":"1.0.0","endpoints":{"health":"/health","auth":"/api/auth","users":"/api/users","marketingPages":"/api/marketing-pages","vio":"/api/campaign/*, /api/token/* (→ VIO_EXTERNAL_API_URL); JWT user/session → VIO_API_URL + /api/miniapp/api/*","vioExternalKey":"/api/vio-external-key (ops: save per-tenant External API key)"}}