fix: genapkovl copy to /var/tmp, udhcpc background mode

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

@@ -22,13 +22,10 @@ for iface in $interfaces; do
     log "bringing up $iface"
     ip link set "$iface" up 2>/dev/null || { log "WARN: could not bring up $iface"; continue; }
 
-    # DHCP: 3 retries, 5s timeout per try, exit without blocking if no offer
-    if udhcpc -i "$iface" -t 3 -T 5 -n -q 2>/dev/null; then
-        IP=$(ip -4 addr show "$iface" | awk '/inet /{print $2}' | head -1)
-        log "OK: $iface got $IP"
-    else
-        log "WARN: $iface — no DHCP offer"
-    fi
+    # DHCP: run in background (-b) so udhcpc persists and retries when cable is connected later.
+    # -t 0: unlimited retries, -T 3: 3s per attempt.
+    udhcpc -i "$iface" -b -t 0 -T 3 -q 2>/dev/null &
+    log "DHCP started for $iface (background, will retry until lease acquired)"
 done
 
 log "done"