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/builder/genapkovl-bee_debug.sh

@@ -70,10 +70,16 @@ rc_add dropbear default
 rc_add bee-nvidia default
 rc_add bee-audit-debug default
 
-if [ -d "$OVERLAY/etc" ]; then cp -r "$OVERLAY/etc/." "$tmp/etc/"; fi
+if [ -d "$OVERLAY/etc" ]; then
+    cp -r "$OVERLAY/etc/." "$tmp/etc/"
+    chmod +x "$tmp/etc/init.d/"* 2>/dev/null || true
+fi
 
 mkdir -p "$tmp/usr"
-if [ -d "$OVERLAY/usr" ]; then cp -r "$OVERLAY/usr/." "$tmp/usr/"; fi
+if [ -d "$OVERLAY/usr" ]; then
+    cp -r "$OVERLAY/usr/." "$tmp/usr/"
+    chmod +x "$tmp/usr/local/bin/"* 2>/dev/null || true
+fi
 
 if [ -d "$OVERLAY/root" ]; then
     mkdir -p "$tmp/root"