Migrate from Fivemanage Lite

Fivemanage Lite is the self-hosted edition: media on an S3-compatible bucket, logs in ClickHouse. The wizard’s S3 source covers the media side — endpoint, bucket, access key, secret — and the importer reads Lite log exports into log import mode with original timestamps preserved.

Moving off Lite also means dropping the self-hosting: no ClickHouse, Postgres or MinIO to run — datasets, retention and dashboards are the hosted equivalents of the Lite configuration pages.