feat(netinfra): 192.168/16 reverse forwarding to Technitium on both nodes [#449]

pi-hole on netinfra-01/02 now conditionally forwards 192.168.0.0/16
reverse lookups to this node's Technitium over dnsnet, alongside the
existing knel.net + 100.64/10 pair. Technitium stays the single source
of truth; pollers (NetDisco, phpIPAM, UNPoller, Wazuh soon) resolving
via either node's :53 now get LAN PTRs. Both live revServer arrays and
this compose file are in sync; validated with forward, PTR (192.168 +
100.x), and external lookups against both nodes.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

netinfra/pihole/docker-compose.yml

@@ -22,6 +22,11 @@ services:
       FTLCONF_dns_rateLimit_count: '0'
       FTLCONF_dns_rateLimit_interval: '0'
       FTLCONF_dns_upstreams: '["8.8.8.8"]'
+      # Conditional forwarding: knel.net + 100.64/10 + 192.168/16 all go to
+      # this node's Technitium (tsys-dns) over the shared dnsnet bridge —
+      # Technitium is the single source of truth for knel.net zones. Set
+      # live 2026-08-26 [#449]; mirrored here so recreation keeps it.
+      FTLCONF_dns_revServers: '["true,100.64.0.0/10,10.53.0.53,knel.net","true,192.168.0.0/16,10.53.0.53"]'
     volumes:
       - './etc-pihole:/etc/pihole'
       - './etc-dnsmasq.d:/etc/dnsmasq.d'