- Mark DM-based sync as incompatible with TiDB Cloud Serverless
- Deprecate sync-control.sh and add warning messages
- Add new sync-data.sh script for syncing data from TiDB Cloud
- Revise README to recommend official migration methods and clarify sync instructions
- Update start.sh to remove references to DM status and control commands
- Add links to TIDB_CLOUD_MIGRATION.md and SYNC_GUIDE.md for detailed guidance
