Enable or disable a bounded provider batch

Creates or updates up to 50 provider-level enablement rows in one transaction, and resets those providers' endpoint-level enablement overrides to inherit so the value you send is the whole answer for every endpoint of every named provider. Endpoint-level MARKUP overrides are preserved. Clients split larger selections into bounded batches so edge inspection cannot reject an oversized request. Batches commit independently: a failure after an earlier batch committed leaves that batch applied.