Add Pi-hole and Traefik LXC containers

- LXC 103 (pihole): Debian 12, 10.10.1.2, Pi-hole v6 with local DNS for
  gitea/grafana/traefik/pihole.homelab, Proxmox dnsmasq updated to use
  Pi-hole upstream
- LXC 104 (traefik): Debian 12, 10.10.1.3, Traefik v3 routing
  gitea.homelab → 10.10.1.125:3000, grafana.homelab → 10.10.1.137:3000
- DNAT rules on vmbr0 forwarding :80/:443 to Traefik, persisted in
  /etc/network/interfaces
- Ansible roles: pihole, traefik; playbooks: pihole.yml, traefik.yml
- site.yml excludes Debian containers from Arch-specific common role

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ansible/roles/traefik/templates/routes.yml.j2

@@ -0,0 +1,17 @@
+http:
+  routers:
+{% for svc in traefik_services %}
+    {{ svc.name }}:
+      rule: "Host(`{{ svc.host }}`)"
+      service: {{ svc.name }}
+      entryPoints:
+        - web
+{% endfor %}
+
+  services:
+{% for svc in traefik_services %}
+    {{ svc.name }}:
+      loadBalancer:
+        servers:
+          - url: "{{ svc.backend }}"
+{% endfor %}

ansible/roles/traefik/templates/traefik.service.j2

@@ -0,0 +1,18 @@
+[Unit]
+Description=Traefik reverse proxy
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=notify
+User=traefik
+Group=traefik
+ExecStart=/usr/local/bin/traefik --configFile=/etc/traefik/traefik.yml
+Restart=on-failure
+RestartSec=5
+NoNewPrivileges=true
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+CapabilityBoundingSet=CAP_NET_BIND_SERVICE
+
+[Install]
+WantedBy=multi-user.target

ansible/roles/traefik/templates/traefik.yml.j2

@@ -0,0 +1,15 @@
+api:
+  dashboard: true
+  insecure: true
+
+entryPoints:
+  web:
+    address: ":{{ traefik_http_port }}"
+
+providers:
+  file:
+    directory: /etc/traefik/conf.d
+    watch: true
+
+log:
+  level: {{ traefik_log_level }}