feat: add ceph service management profiles and facts

Adds Unkin::Ceph::Utils facter module (ceph_services.rb) which detects
ceph service instances via systemctl and exposes is_ceph_mon, is_ceph_mgr,
is_ceph_mds, is_ceph_osd booleans and a ceph_services hash of unit names.

Adds profiles::ceph::mon, mgr, mds, osd — each with a Boolean $ensure_running
parameter that iterates discovered service instances and manages them as
running and enabled. Works across incus nodes (mon/mgr/mds/osd) and k8s
compute/control nodes (osd only).

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

site/profiles/manifests/ceph/mon.pp

@@ -0,0 +1,13 @@
+class profiles::ceph::mon (
+  Boolean $ensure_running = true,
+) {
+
+  if $ensure_running and $facts['is_ceph_mon'] {
+    $facts['ceph_services']['mon'].each |String $svc| {
+      service { $svc:
+        ensure => running,
+        enable => true,
+      }
+    }
+  }
+}