Umbra Studio v0.22.8

ComfyUI Auto-Start Hotfix

• Fixed the global Launch ComfyUI on startup setting being persisted but never
  dispatched during Umbra Studio startup.
• Added a delayed backend-owned launch after Umbra binds its server, preserving
  responsive startup while using the same managed portable ComfyUI lifecycle as
  the workspace Launch control.
• Added isolated auto-launch handling so a failed optional backend cannot block
  Umbra Studio startup or other configured startup work.