SearXNG: define the gluetun+searxng+valkey trio as quadlet units

Converts the podman-compose SearXNG stack to boot-persistent quadlet units so
it survives a reboot (the compose deployment did not). searxng sets
Network=gluetun.container, which makes it reuse gluetun's network namespace so
outbound search traffic exits the WireGuard tunnel; it publishes no port of its
own (the port lives on gluetun). gluetun and valkey join a pinned searxng
network (10.89.2.0/24, DNS-enabled) so searxng reaches valkey by name.

Secrets stay in /opt/searxng/.env (mode 0600), referenced via [Service]
EnvironmentFile= so ${VAR} expands. Adds a bats seam asserting the netns
wiring, port placement, boot install, and that no secret material is tracked.

dankclaw/searxng/quadlet/gluetun.container

@@ -0,0 +1,39 @@
+# Quadlet unit: Gluetun VPN tunnel (rootless, boot-persistent).
+#
+# Install path on dankclaw: ~/.config/containers/systemd/gluetun.container
+# Unit name: gluetun.service (container name: gluetun)
+#
+# Creates the WireGuard tunnel to ProtonVPN (US-WA). SearXNG reuses this
+# container's network namespace (see searxng.container), so its outbound search
+# traffic exits here. The WireGuard credentials live in /opt/searxng/.env
+# (mode 0600); this file holds no secrets. See docs/Dankclaw/Gluetun.md.
+
+[Unit]
+Description=Gluetun VPN tunnel container
+Wants=searxng-network.service
+After=searxng-network.service network.target
+
+[Container]
+ContainerName=gluetun
+Network=searxng.network
+Image=docker.io/qmcgaw/gluetun:latest
+CapAdd=NET_ADMIN
+Device=/dev/net/tun:/dev/net/tun
+Environment=VPN_SERVICE_PROVIDER=${VPN_SERVICE_PROVIDER}
+Environment=VPN_TYPE=${VPN_TYPE}
+Environment=WIREGUARD_PRIVATE_KEY=${WIREGUARD_PRIVATE_KEY}
+Environment=WIREGUARD_ADDRESSES=${WIREGUARD_ADDRESSES}
+Environment=WIREGUARD_PUBLIC_KEY=${WIREGUARD_PUBLIC_KEY}
+Environment=WIREGUARD_ENDPOINT_IP=${WIREGUARD_ENDPOINT_IP}
+Environment=WIREGUARD_ENDPOINT_PORT=${WIREGUARD_ENDPOINT_PORT}
+Environment=WIREGUARD_ALLOWED_IPS=${WIREGUARD_ALLOWED_IPS}
+Environment=WIREGUARD_PERSISTENT_KEEPALIVE_INTERVAL=${WIREGUARD_PERSISTENT_KEEPALIVE_INTERVAL}
+PublishPort=8081:8080
+
+[Service]
+EnvironmentFile=/opt/searxng/.env
+TimeoutStartSec=900
+Restart=always
+
+[Install]
+WantedBy=default.target

dankclaw/searxng/quadlet/searxng-valkey.container

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+# Quadlet unit: Valkey cache for SearXNG (rootless, boot-persistent).
+#
+# Install path on dankclaw: ~/.config/containers/systemd/searxng-valkey.container
+# Unit name: searxng-valkey.service (container name: searxng-valkey)
+#
+# The limiter's rate-limit state store. Joins the searxng network and is
+# reachable by the name "valkey" (settings.yml points there). Data persists in
+# /opt/searxng/valkey. See docs/Dankclaw/Valkey.md.
+
+[Unit]
+Description=SearXNG Valkey cache container
+Wants=searxng-network.service
+After=searxng-network.service network.target
+
+[Container]
+ContainerName=searxng-valkey
+Network=searxng.network
+NetworkAlias=valkey
+Image=docker.io/valkey/valkey:9-alpine
+Volume=/opt/searxng/valkey:/data
+
+[Service]
+EnvironmentFile=/opt/searxng/.env
+TimeoutStartSec=900
+Restart=always
+
+[Install]
+WantedBy=default.target

dankclaw/searxng/quadlet/searxng.container

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+# Quadlet unit: SearXNG search engine (rootless, boot-persistent).
+#
+# Install path on dankclaw: ~/.config/containers/systemd/searxng.container
+# Unit name: searxng.service (container name: searxng)
+#
+# Reuses gluetun's network namespace (Network=gluetun.container) so its
+# outbound traffic exits the WireGuard tunnel. It publishes no port of its own;
+# the port lives on gluetun. It reaches valkey by name on the searxng network.
+# Config mounts from /opt/searxng/config. See docs/Dankclaw/SearXNG.md.
+
+[Unit]
+Description=SearXNG search engine container
+Wants=gluetun.service searxng-valkey.service
+After=gluetun.service searxng-valkey.service network.target
+
+[Container]
+ContainerName=searxng
+Network=gluetun.container
+Image=ghcr.io/searxng/searxng:latest
+Environment=SEARXNG_SECRET=${SEARXNG_SECRET}
+Environment=SEARXNG_BASE_URL=${SEARXNG_BASE_URL}
+Volume=/opt/searxng/config:/etc/searxng
+
+[Service]
+EnvironmentFile=/opt/searxng/.env
+TimeoutStartSec=900
+Restart=always
+
+[Install]
+WantedBy=default.target

dankclaw/searxng/quadlet/searxng.network

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+# Quadlet network: private bridge for the SearXNG stack (rootless).
+#
+# Install path on dankclaw: ~/.config/containers/systemd/searxng.network
+# Unit name: searxng-network.service (podman network name: systemd-searxng)
+#
+# DNS is enabled by default for quadlet networks. This matters: the automatic
+# "podman" default network has dns_enabled=false, so container names would not
+# resolve. searxng (which reuses gluetun's netns) reaches valkey by the name
+# "valkey" on this network.
+#
+# The subnet is pinned so the value stays stable across reboots. It must match
+# an entry in shared/searxng/limiter.toml trusted_proxies. 10.89.2.0/24 is free
+# (gitea uses 10.89.0.0/24; the old compose net used 10.89.1.0/24).
+
+[Network]
+Subnet=10.89.2.0/24