feat: derive PBS backup jobs and audit VMIDs from the service registry

- pve-backup-jobs.yml: each job's vmid list is now computed from
  homelab_services by backup.job instead of a hand-maintained CSV. Adding a
  service no longer needs a separate edit here (the forgotten-edit failure
  mode that left CT 148 emergency-bot without a backup).
- roles/backup_audit/defaults: backup_audit_pbs_vmids derived from
  homelab_services by the monitoring.backup_audit_vmid flag; single shared
  freshness threshold backup_audit_pbs_max_age_hours (48).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012uoq5AVK8mkBgg83Mq6o5V

ansible/playbooks/pve-backup-jobs.yml

@@ -1,3 +1,7 @@
+# Списки VMID выводятся из реестра homelab_services по полю backup.job, а не
+# перечисляются вручную. Раньше добавление сервиса требовало отдельной правки
+# здесь, и о ней легко было забыть — CT 148 emergency-bot до сих пор без бэкапа
+# именно по этой причине.
 - name: Configure Proxmox backup jobs
   hosts: mini-pc
   gather_facts: false
@@ -6,7 +10,10 @@
       - id: homelab-pbs-daily-cloud
         comment: Daily PBS backup for cloud-pc service containers
         node: cloud-pc
-        vmid: 141,145,146,147,149
+        vmid: >-
+          {{ homelab_services.values() | selectattr('backup.job', 'defined')
+             | selectattr('backup.job', 'eq', 'homelab-pbs-daily-cloud')
+             | map(attribute='vmid') | sort | join(',') }}
         storage: pbs
         schedule: "02:10"
         mode: snapshot
@@ -14,7 +21,10 @@
       - id: homelab-pbs-daily-mini
         comment: Daily PBS backup for mini-pc service containers
         node: mini-pc
-        vmid: 132,140,142,143,144,150
+        vmid: >-
+          {{ homelab_services.values() | selectattr('backup.job', 'defined')
+             | selectattr('backup.job', 'eq', 'homelab-pbs-daily-mini')
+             | map(attribute='vmid') | sort | join(',') }}
         storage: pbs
         schedule: "02:40"
         mode: snapshot
@@ -22,7 +32,10 @@
       - id: homelab-local-weekly-pbs
         comment: Weekly local backup for PBS container rootfs/config
         node: cloud-pc
-        vmid: 120
+        vmid: >-
+          {{ homelab_services.values() | selectattr('backup.job', 'defined')
+             | selectattr('backup.job', 'eq', 'homelab-local-weekly-pbs')
+             | map(attribute='vmid') | sort | join(',') }}
         storage: backup
         schedule: "Sun 03:30"
         mode: snapshot