fix: init scripts not executable, add autologin and build version in motd

- bee-* init.d scripts had mode 644 in git — OpenRC silently skipped them,
  causing bee-network/bee-nvidia/bee-audit to never start at boot
- bee-network.sh also lacked executable bit
- Remove -q from udhcpc (was quitting after first lease, no renewal)
- Add autologin root on tty1 via /etc/inittab
- Inject build date + git commit + versions into motd at build time

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

iso/overlay-debug/usr/local/bin/bee-network.sh

@@ -23,9 +23,9 @@ for iface in $interfaces; do
     ip link set "$iface" up 2>/dev/null || { log "WARN: could not bring up $iface"; continue; }
 
     # DHCP: run in background (-b) so udhcpc persists and retries when cable is connected later.
-    # -t 0: unlimited retries, -T 3: 3s per attempt.
-    udhcpc -i "$iface" -b -t 0 -T 3 -q 2>/dev/null &
-    log "DHCP started for $iface (background, will retry until lease acquired)"
+    # -t 0: unlimited retries, -T 3: 3s per attempt. No -q: stay running to renew lease.
+    udhcpc -i "$iface" -b -t 0 -T 3
+    log "DHCP started for $iface (background, will retry and renew lease)"
 done
 
 log "done"