Pi-hole swap: quadlet + env + records + Caddy vhost (retires dnsmasq)

- dankclaw/pihole/: pihole.container (quadlet, slirp4netns, 53+8083),
  env.example (ServerIP/TZ/DNS1/DNS2/WEBPASSWORD placeholders), addn-hosts
  (moved from dankclaw/dnsmasq/, + pihole.franksdank.cloud record)
- Caddyfile: pihole.franksdank.cloud vhost (family basicauth -> 8083)
- scripts/deploy-pihole-quadlet.sh: idempotent quadlet installer
- tests/pihole.bats replaces tests/dnsmasq.bats (same record validation
  + cross-checks, new quadlet/env seams); retired files in .AGENTTRASH/

dankclaw/pihole/quadlet/pihole.container

@@ -0,0 +1,42 @@
+# Quadlet unit: Pi-hole LAN DNS (rootless, boot-persistent).
+#
+# Install path on dankclaw: ~/.config/containers/systemd/pihole.container
+# Unit name: pihole.service (container name: pihole)
+#
+# The LAN's authoritative DNS for the flat franksdank.cloud / franksdank.casa
+# name scheme. It retired the dnsmasq quadlet (2026-08-24): Pi-hole FTL is a
+# dnsmasq fork, so the addn-hosts record file carries over unchanged and is
+# mounted into /etc/dnsmasq.d/ (the FTL dnsmasq config dir). It serves one A
+# record per Caddy vhost and forwards everything else to the pinned upstream
+# resolvers (DNS1/DNS2 in the env file). The SURFboard G36 router hands this
+# server out to DHCP clients (DNS statically configured -> 192.168.0.143),
+# so no client needs per-device config.
+#
+# Runs on slirp4netns with port 53 (DNS) and 8083 (web UI) published to the
+# LAN (the same pattern as open-webui). Config + state mount from
+# /home/dank/Containers/pihole. The web UI password is WEBPASSWORD in the env
+# file. See docs/Infrastructure/LAN-DNS.md.
+
+[Unit]
+Description=Pi-hole LAN DNS container
+After=network-online.target
+Wants=network-online.target
+
+[Container]
+ContainerName=pihole
+Image=docker.io/pihole/pihole:latest
+Network=slirp4netns
+PublishPort=0.0.0.0:53:53/udp
+PublishPort=0.0.0.0:53:53/tcp
+PublishPort=0.0.0.0:8083:80/tcp
+EnvironmentFile=/home/dank/Containers/pihole/env
+Volume=/home/dank/Containers/pihole/etc-pihole:/etc/pihole
+Volume=/home/dank/Containers/pihole/etc-dockers:/etc/dockers
+Volume=/home/dank/Containers/pihole/addn-hosts:/etc/dnsmasq.d/addn-hosts:ro
+
+[Service]
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=default.target