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/hosts.yml

@@ -0,0 +1,26 @@
+---
+all:
+  children:
+    docker_hosts:
+      hosts:
+        peggy:
+          ansible_host: 192.168.86.45
+        bart:
+          ansible_host: 192.168.86.181
+    nvr:
+      hosts:
+        bart:
+        yoda:
+          ansible_host: 192.168.86.31
+          ansible_connection: local
+          ansible_shell_type: cmd
+    network:
+      hosts:
+        firewalla:
+          ansible_host: 192.168.86.1
+          ansible_connection: local
+    storage:
+      hosts:
+        nas:
+          ansible_host: 192.168.86.30
+          ansible_connection: local