multiDcTopology

Multi-DC topology signal — not user-set directly (hence InternalKandraApi). Automatically derived and populated by the Kandra Ktor plugin's install path from KandraConfig.loadBalancing.allowedRemoteDcs.isNotEmpty(). A user configuring multi-DC failover already sets allowedRemoteDcs; combined with strictMode, StatementBuilder can then warn on LOCAL_ONE/ONE resolutions without requiring any additional user-facing config, and without kandra-runtime depending on kandra-multidc (or vice versa).