Move the rendering of the script log "More" link from the backend's `stage_log` content to the frontend. The backend now provides a `has_script_log` flag, allowing the frontend to dynamically display the link and fetch the script log on demand.
Includes a database migration to clean up old embedded links in existing `stage_log` entries. This improves separation of concerns, simplifies `stage_log` data, and allows for more flexible frontend rendering.