Single `consumer` object

• Replace separate consumerId / consumerName parameters with a single consumer object ({ id?, nickname? }) across all relevant APIs:
  • query.update(), query.insert(), query.upsert(), query.archive() now accept consumer?: { id?: number | string, nickname?: string } instead of two separate arguments
  • Express middlewares (add, update, upsert, archive, sync) now read res.locals.consumer.id and res.locals.consumer.nickname instead of res.locals.consumerId / res.locals.consumerName