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/monitoring/templates/docker-compose.yml.j2

@@ -0,0 +1,86 @@
+services:
+  prometheus:
+    image: {{ prometheus_image }}
+    container_name: prometheus
+    restart: unless-stopped
+    command:
+      - --config.file=/etc/prometheus/prometheus.yml
+      - --storage.tsdb.path=/prometheus
+      - --storage.tsdb.retention.time={{ prometheus_retention }}
+      - --web.enable-lifecycle
+    volumes:
+      - {{ prometheus_data_dir }}/config/prometheus.yml:/etc/prometheus/prometheus.yml:ro
+      - {{ prometheus_data_dir }}/data:/prometheus
+    labels:
+      traefik.enable: "true"
+      traefik.http.routers.prometheus.rule: "Host(`{{ prometheus_host }}`)"
+      traefik.http.routers.prometheus.entrypoints: websecure
+      traefik.http.routers.prometheus.tls.certresolver: cloudflare
+      traefik.http.services.prometheus.loadbalancer.server.port: "9090"
+    networks:
+      - {{ docker_network_name }}
+
+  grafana:
+    image: {{ grafana_image }}
+    container_name: grafana
+    restart: unless-stopped
+    environment:
+      GF_SECURITY_ADMIN_PASSWORD: {{ grafana_admin_password }}
+      GF_SERVER_ROOT_URL: "https://{{ grafana_host }}"
+      GF_SERVER_DOMAIN: "{{ grafana_host }}"
+    volumes:
+      - {{ grafana_data_dir }}:/var/lib/grafana
+    labels:
+      traefik.enable: "true"
+      traefik.http.routers.grafana.rule: "Host(`{{ grafana_host }}`)"
+      traefik.http.routers.grafana.entrypoints: websecure
+      traefik.http.routers.grafana.tls.certresolver: cloudflare
+      traefik.http.services.grafana.loadbalancer.server.port: "3000"
+    networks:
+      - {{ docker_network_name }}
+
+  alertmanager:
+    image: {{ alertmanager_image }}
+    container_name: alertmanager
+    restart: unless-stopped
+    command:
+      - --config.file=/etc/alertmanager/alertmanager.yml
+    volumes:
+      - {{ alertmanager_data_dir }}/config/alertmanager.yml:/etc/alertmanager/alertmanager.yml:ro
+    labels:
+      traefik.enable: "true"
+      traefik.http.routers.alertmanager.rule: "Host(`{{ alertmanager_host }}`)"
+      traefik.http.routers.alertmanager.entrypoints: websecure
+      traefik.http.routers.alertmanager.tls.certresolver: cloudflare
+      traefik.http.services.alertmanager.loadbalancer.server.port: "9093"
+    networks:
+      - {{ docker_network_name }}
+
+  node-exporter:
+    image: {{ node_exporter_image }}
+    container_name: node-exporter
+    restart: unless-stopped
+    command:
+      - --path.rootfs=/host
+    volumes:
+      - /:/host:ro,rslave
+    pid: host
+    networks:
+      - {{ docker_network_name }}
+
+  cadvisor:
+    image: {{ cadvisor_image }}
+    container_name: cadvisor
+    restart: unless-stopped
+    privileged: true
+    volumes:
+      - /:/rootfs:ro
+      - /var/run:/var/run:ro
+      - /sys:/sys:ro
+      - /var/lib/docker:/var/lib/docker:ro
+    networks:
+      - {{ docker_network_name }}
+
+networks:
+  {{ docker_network_name }}:
+    external: true