feat(dcgm): add NVIDIA DCGM diagnostics, fix KVM console

- Add 9002-nvidia-dcgm.hook.chroot: installs datacenter-gpu-manager
  from NVIDIA apt repo during live-build
- Enable nvidia-dcgm.service in chroot setup hook
- Replace bee-gpu-stress with dcgmi diag (levels 1-4) in NVIDIA SAT
- TUI: replace GPU checkbox + duration UI with DCGM level selection
- Remove console=tty2 from boot params: KVM/VGA now shows tty1
  where bee-tui runs, fixing unresponsive console

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/tui/update.go

@@ -112,8 +112,6 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.screen = screenExportTargets
 		m.cursor = 0
 		return m, m.refreshSnapshotCmd()
-	case nvidiaGPUsMsg:
-		return m.handleNvidiaGPUsMsg(msg)
 	case nvtopClosedMsg:
 		return m, nil
 	case gpuStressDoneMsg: