add `sol remote rename` and host-mismatch warning on ingest
Rename updates the remote metadata name, which changes the stream
name for future uploads. Existing segments stay under the old stream.
The ingest endpoint now logs a warning when a remote's reported host
differs from its registered name, making hostname renames visible
in the logs before they cause stream splits.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>