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/usr/local/bin/bee-openbox-session

@@ -9,22 +9,14 @@ xset s noblank
 
 tint2 &
 
-# Wait up to 120s for bee-web to bind. The web server starts immediately now
-# (audit is deferred), so this should succeed in a few seconds on most hardware.
-i=0
-while [ $i -lt 120 ]; do
-    if curl -sf http://localhost/healthz >/dev/null 2>&1; then break; fi
-    sleep 1
-    i=$((i+1))
-done
-
 chromium \
     --disable-infobars \
     --disable-translate \
     --no-first-run \
     --disable-session-crashed-bubble \
     --disable-features=TranslateUI \
+    --user-data-dir=/tmp/bee-chrome \
     --start-maximized \
-    http://localhost/ &
+    http://localhost/loading &
 
 exec openbox