Improve boot UX: status display, faster GUI, loading spinner

- Add bee-boot-status service: shows live service status on tty1 with
  ASCII logo before getty, exits when all bee services settle
- Remove lightdm dependency on bee-preflight so GUI starts immediately
  without waiting for NVIDIA driver load
- Replace Chromium blank-page problem with /loading spinner page that
  polls /api/services and auto-redirects when services are ready; add
  "Open app now" override button; use fresh --user-data-dir=/tmp/bee-chrome
- Unify branding: add "Hardware Audit LiveCD" subtitle to GRUB menu,
  bee-boot-status (with yellow ASCII logo), and web spinner

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

iso/overlay/etc/systemd/system/lightdm.service.d/bee-display-mode.conf

@@ -1,6 +1,4 @@
 [Unit]
-Wants=bee-preflight.service
-After=bee-preflight.service
 
 [Service]
 ExecStartPre=/usr/local/bin/bee-display-mode