fix(led-pulse): Check HAProxy on host instead of LXC container

HAProxy runs on the host, not in an LXC container. The LED pulse
script was incorrectly checking `lxc-attach -n haproxy -- pgrep haproxy`
which always failed, causing constant SPUNK ALERT red LED flashing.

Changed to check host process directly with `pgrep haproxy`.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package/secubox/secubox-core/root/usr/sbin/secubox-led-pulse

@@ -32,7 +32,8 @@ check_critical_services() {
     local critical=0
 
     # HAProxy must be running (PERMANENT priority)
-    if ! lxc-attach -n haproxy -- pgrep haproxy >/dev/null 2>&1; then
+    # Check host process (HAProxy runs on host, not in LXC)
+    if ! pgrep haproxy >/dev/null 2>&1; then
         critical=1
     fi