Remove deprecated one-shot scripts and update first-boot configuration for improved provisioning</message>

<message>Delete obsolete one-shot scripts for setting screen rotation and wallpaper, as well as related Python and shell scripts. Update the first-boot configuration to streamline the provisioning process by removing references to these scripts. This cleanup enhances maintainability and focuses on the essential steps required for the first boot experience, ensuring a more efficient setup for users.

emmc-provisioning/cloud-init/fileserver/steps/06-lightdm.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# Step 06: LightDM session config + DSI panel wait service
+
+step_06_lightdm() {
+  mkdir -p /etc/lightdm/lightdm.conf.d
+
+  curl -fsSL "${FILE_SERVER}/99-default-session.conf" \
+    -o /etc/lightdm/lightdm.conf.d/99-default-session.conf 2>/dev/null || true
+
+  if [[ -f /etc/lightdm/lightdm.conf ]]; then
+    sed -i "s/^user-session=.*/user-session=$LIGHTDM_SESSION/" /etc/lightdm/lightdm.conf
+    sed -i "s/^autologin-session=.*/autologin-session=$LIGHTDM_SESSION/" /etc/lightdm/lightdm.conf
+    log "LightDM session set to $LIGHTDM_SESSION"
+  fi
+
+  # Wait for DSI panel to report "connected" before LightDM starts (max 30s)
+  mkdir -p /etc/systemd/system/lightdm.service.d
+  cat > /etc/systemd/system/cm4-await-display.service << 'AWAITSVC'
+[Unit]
+Description=Wait for reTerminal DM DSI panel before LightDM
+Before=lightdm.service
+DefaultDependencies=no
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/bin/sh -c 'echo "Waiting for DSI panel..."; for i in $(seq 1 30); do for f in /sys/class/drm/card*-DSI-1/status; do [ -f "$f" ] && [ "$(cat "$f" 2>/dev/null)" = "connected" ] && echo "DSI connected." && exit 0; done; sleep 1; done; echo "DSI timeout (30s), starting anyway."'
+TimeoutStartSec=35
+
+[Install]
+WantedBy=graphical.target
+AWAITSVC
+
+  printf '%s\n' '[Unit]' 'After=cm4-await-display.service' \
+    > /etc/systemd/system/lightdm.service.d/99-await-display.conf
+  systemctl daemon-reload
+  systemctl enable cm4-await-display.service 2>/dev/null || true
+  log "cm4-await-display.service installed (wait for DSI, max 30s)"
+}