fix: chmod +x in genapkovl to fix permissions regardless of git filemode on VM

- genapkovl now explicitly chmod +x init.d/* and usr/local/bin/* after cp
- add bee-net-restart command (short name, no .sh) and /etc/profile.d/bee.sh for PATH
- udhcpc: add & to ensure non-blocking even when DHCP responds immediately
- motd: short commands without paths

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

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

@@ -22,10 +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: run in background (-b) so udhcpc persists and retries when cable is connected later.
+    # DHCP in background: -b forks if no immediate lease, & ensures non-blocking always.
     # -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 $iface (background, will retry and renew lease)"
+    udhcpc -i "$iface" -b -t 0 -T 3 &
+    log "DHCP started for $iface (pid $!)"
 done
 
 log "done"