Initial Ansible automation for hobbs.farm infrastructure

Complete IaC covering:
- 14 roles: common, docker, traefik, vaultwarden, monitoring, media, matrix,
  home_assistant, frigate, adguard, gitea, semaphore, openclaw, security, backup
- Inventory for all hosts (Peggy, Bart, Yoda, NAS, Firewalla)
- Stack playbooks: core-infrastructure, monitoring, media, communication,
  automation, smarthome, security-hardening
- Maintenance playbooks: update-containers, backup, health-check
- Production Docker Compose templates with Traefik labels
- Security hardening (sysctl, auditd, UFW, fail2ban)
- Automated backups with retention policy

inventory/host_vars/bart.yml

@@ -0,0 +1,14 @@
+---
+ansible_host: 192.168.86.181
+hostname: bart
+hardware_description: "Intel i5-4570T, 16GB RAM"
+os: "Ubuntu"
+
+# Frigate-specific
+frigate_config_dir: /opt/frigate/config
+frigate_media_dir: /media/frigate
+coral_device: /dev/bus/usb
+
+backup_sources:
+  - /opt/frigate/config
+backup_destination: /mnt/nas/backups/bart