feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

scripts/uninstall-systemd.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [ "$(id -u)" -ne 0 ]; then
+    printf 'Run this uninstaller as root.\n' >&2
+    exit 1
+fi
+
+systemctl disable --now rsmon-worker.service 2>/dev/null || true
+rm -f /etc/systemd/system/rsmon-worker.service /usr/local/bin/rsmon-worker
+systemctl daemon-reload
+
+printf 'Binary and service removed. Configuration and state were preserved in:\n'
+printf '  /etc/rsmon-worker\n  /var/lib/rsmon-worker\n'