Auto-start X on boot: autologin root on TTY1, startx from .bash_profile

Also add all OrionOS binaries to file_permissions so archiso sets 755
on them in the squashfs (fixes Permission denied from xinitrc).

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

iso/profile/airootfs/root/.bash_profile

@@ -0,0 +1,3 @@
+if [[ -z $DISPLAY ]] && [[ $(tty) == /dev/tty1 ]]; then
+    exec startx
+fi