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

roles/backup/defaults/main.yml

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+---
+backup_script_path: /usr/local/bin/homelab-backup.sh
+backup_schedule: "0 2 * * *"
+backup_retention_days: 30
+backup_sources:
+  - /data/docker-compose
+backup_destination: /mnt/nas/backups/{{ inventory_hostname }}
+backup_pre_commands: []
+backup_post_commands: []

roles/backup/tasks/main.yml

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+---
+- name: Ensure backup destination directory exists
+  ansible.builtin.file:
+    path: "{{ backup_destination }}"
+    state: directory
+    owner: glyptic
+    group: glyptic
+    mode: "0750"
+  tags: [backup]
+
+- name: Deploy backup script
+  ansible.builtin.template:
+    src: backup.sh.j2
+    dest: "{{ backup_script_path }}"
+    owner: root
+    group: root
+    mode: "0750"
+  tags: [backup]
+
+- name: Configure backup cron job
+  ansible.builtin.cron:
+    name: "homelab-backup"
+    minute: "0"
+    hour: "2"
+    job: "{{ backup_script_path }} >> /var/log/homelab-backup.log 2>&1"
+    user: root
+  tags: [backup]
+
+- name: Configure backup log rotation
+  ansible.builtin.copy:
+    content: |
+      /var/log/homelab-backup.log {
+        weekly
+        rotate 4
+        compress
+        missingok
+        notifempty
+      }
+    dest: /etc/logrotate.d/homelab-backup
+    owner: root
+    group: root
+    mode: "0644"
+  tags: [backup]

roles/backup/templates/backup.sh.j2

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+#!/bin/bash
+# Homelab Backup Script - Managed by Ansible
+# Host: {{ inventory_hostname }}
+
+set -euo pipefail
+
+BACKUP_DIR="{{ backup_destination }}"
+DATE=$(date +%Y%m%d_%H%M%S)
+HOSTNAME="{{ inventory_hostname }}"
+BACKUP_FILE="${BACKUP_DIR}/${HOSTNAME}_${DATE}.tar.gz"
+RETENTION_DAYS="{{ backup_retention_days }}"
+
+echo "=== Backup started at $(date) ==="
+echo "Destination: ${BACKUP_FILE}"
+
+# Pre-backup commands
+{% for cmd in backup_pre_commands %}
+echo "Running pre-backup: {{ cmd }}"
+{{ cmd }}
+{% endfor %}
+
+# Create backup
+tar czf "${BACKUP_FILE}" \
+{% for source in backup_sources %}
+  {{ source }} \
+{% endfor %}
+  2>/dev/null || true
+
+BACKUP_SIZE=$(du -sh "${BACKUP_FILE}" | cut -f1)
+echo "Backup created: ${BACKUP_FILE} (${BACKUP_SIZE})"
+
+# Post-backup commands
+{% for cmd in backup_post_commands %}
+echo "Running post-backup: {{ cmd }}"
+{{ cmd }}
+{% endfor %}
+
+# Cleanup old backups
+echo "Removing backups older than ${RETENTION_DAYS} days..."
+find "${BACKUP_DIR}" -name "${HOSTNAME}_*.tar.gz" -mtime +${RETENTION_DAYS} -delete
+
+echo "=== Backup completed at $(date) ==="