The staggered Initialize goroutine kept calling AddSystem after the hub
had been torn down, which spawned StartUpdater goroutines that later
dereferenced a nil DB inside PocketBase. Track a manager-level context
that RemoveAllSystems cancels, abort the staggered loop on shutdown,
and refuse AddSystem once the manager is stopped.
- add includedetails flag to data requests for better efficiency
- integrate docker host info api for better os detection
- pull more OS details as well as cpu arch
- separate info bar component and refactor for new info
