fix: use getty auto-login instead of systemd TTY service for first-boot setup

Replaces kiosk-firstboot.service (which got SIGHUP'd by getty) with a
simpler approach: configure getty@tty1 to auto-login root, run kiosk-setup
from .bash_profile. Cleaner TTY ownership — no service/getty conflicts.
install-kiosk.sh now removes the auto-login config and kiosk-setup script
on completion so root doesn't auto-login after the kiosk is running.

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

preseed-bootstrap.sh

@@ -2,9 +2,8 @@
 set -e
 
 # Downloaded and run by the preseed late_command after Debian base install.
-# Fetches install-kiosk.sh and installs it as a first-boot setup service.
-# The service runs interactively on the first reboot, prompts for name/username,
-# then installs the kiosk and reboots into kiosk mode.
+# Fetches install-kiosk.sh, configures getty@tty1 to auto-login as root,
+# and runs the setup wizard automatically on first reboot.
 
 REPO_BASE="https://gitea.jgitta.com/jgitta/senior-kiosk/raw/branch/master"
 
@@ -12,30 +11,24 @@ echo "==> SeniorNet: downloading setup script..."
 curl -fsSL "$REPO_BASE/install-kiosk.sh" -o /usr/local/bin/kiosk-setup
 chmod +x /usr/local/bin/kiosk-setup
 
-echo "==> SeniorNet: installing first-boot service..."
-cat > /etc/systemd/system/kiosk-firstboot.service << 'EOF'
-[Unit]
-Description=SeniorNet Kiosk First-Boot Setup
-After=network-online.target
-Wants=network-online.target
-Conflicts=getty@tty1.service
-After=getty@tty1.service
-
+echo "==> SeniorNet: configuring auto-login on TTY1..."
+mkdir -p /etc/systemd/system/getty@tty1.service.d
+cat > /etc/systemd/system/getty@tty1.service.d/autologin.conf << 'EOF'
 [Service]
-Type=oneshot
-ExecStart=/usr/local/bin/kiosk-setup
-StandardInput=tty
-TTYPath=/dev/tty1
-TTYReset=yes
-IgnoreSIGPIPE=no
-RemainAfterExit=no
-
-[Install]
-WantedBy=multi-user.target
+ExecStart=
+ExecStart=-/sbin/agetty --autologin root --noclear %I $TERM
 EOF
 
-systemctl enable kiosk-firstboot
-# Boot to text mode for the first-boot wizard, then kiosk setup switches to graphical
+echo "==> SeniorNet: configuring setup to run on first login..."
+cat >> /root/.bash_profile << 'EOF'
+
+# SeniorNet first-boot setup — runs once then removes itself
+if [ -x /usr/local/bin/kiosk-setup ]; then
+    /usr/local/bin/kiosk-setup
+fi
+EOF
+
+# Boot to text mode for the setup wizard
 systemctl set-default multi-user.target
 
-echo "==> SeniorNet: ready. First-boot setup will run on next reboot."
+echo "==> SeniorNet: ready. Setup wizard will run automatically on next reboot."