fix(desktop): start X on vt1 from .profile for IPMI KVM compatibility

startx from autologin shell targets VT1 directly — KVM sees the
graphical UI without VT switching. Remove bee-desktop.service
(systemd-launched X defaults to VT7, invisible on KVM).
Add xserver-xorg-video-fbdev for server AST/VGA framebuffer.

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

iso/overlay/etc/systemd/system/bee-desktop.service

@@ -1,16 +0,0 @@
-[Unit]
-Description=Bee: local desktop (openbox + chromium)
-After=bee-web.service
-Wants=bee-web.service
-
-[Service]
-User=bee
-Environment=DISPLAY=:0
-ExecStart=/usr/local/bin/bee-desktop
-Restart=on-failure
-RestartSec=3
-StandardOutput=journal
-StandardError=journal
-
-[Install]
-WantedBy=multi-user.target