fix: report which services are enabled, and whether an action worked

get_services() read list-unit-files' second column, which since systemd 245
is followed by a preset column -- "enabled  enabled" never equalled
"enabled", so every service on every node was reported disabled (#6).
manage_service() ended in "|| true" and returned success whatever happened.

Both now come from napalm-device-types' SystemdServicesMixin (2.2.0): the
enabled state is UnitFileState from systemctl show, MainPID comes along in
the same round trip, and an action reports systemctl's exit status. The
driver keeps only _run_service_command(), its exec path as root. The exit
status marker keeps the output non-empty, so _exec_ssh_command's SSH fallback
on an empty API answer can no longer run an action twice.

The listing no longer includes templates, static unit files and aliases that
are not loaded (on a PVE 9 node: 280 entries -> 172).

Closes #6

pyproject.toml

@@ -25,7 +25,7 @@ classifiers = [
 requires-python = ">=3.9"
 dependencies = [
     "napalm>=5.0.0",
-    "napalm_device_types>=2.1.0",
+    "napalm_device_types>=2.2.0",
     "paramiko>=5.0.0",  # CVE-2026-44405; imported directly for SSH fallback (driver.py)
     "proxmoxer>=2.0.0",
     "netaddr>=0.9.0",