Remove the enable/disable toggle from the server UI, logs page, and
Sentinel API so is_sentinel_enabled is derived and read-only. Enable
existing regular servers via migration, start Sentinel after validate-
and-install, and drop the daily ServerManagerJob restart.
Unify service backup history with pagination, schedule settings actions, S3 destination details, and team-safe access checks. Display server built-ins as read-only variables and add loading and empty states for searchable resources.
