docs: post-migration changelog entries on hubris, caddy, dns

hosts/hubris.md:
- Update At a glance network section: vmbr1 uplink (192.168.178.10),
  vmbr0 portless internal bridge with 192.168.8.1 alias
- Remove Phase 1 WiFi failover section (wlp3s0 disabled 2026-06-02)
- Changelog: Slate AX retired, SODOLA added, Proxmox as subnet router

containers/121-caddy.md:
- Changelog: caddy.service unit was missing from hubris1 package,
  recreated manually; risk of loss on package reinstall noted

containers/107-dns.md:
- Update Who points here: Technitium DHCP hands out .2 as DNS for
  homelab clients; Fritz!Box LAN clients still get Fritz!Box DNS
- Add DHCP section documenting the homelab scope (100-240, gw .1)
- Changelog: DHCP enabled 2026-06-02, replaces Slate AX DHCP

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

containers/121-caddy.md

@@ -65,6 +65,9 @@ Gitea webhook id 2 on `dtoro/caddy-conf`. Receiver, deploy script, install scrip
 
 ## Changelog
 
+### 2026-06-02 — caddy.service unit missing; recreated
+After the Slate AX → SODOLA network migration, Caddy was not listening (ports 80/443 dead). Root cause: the custom hubris1 Debian package (`caddy_1:2.11.3-hubris1_amd64`) does not ship a systemd service unit file. The unit had previously existed but was lost (likely on a package reinstall). Recreated at `/lib/systemd/system/caddy.service` with standard Caddy service config + `EnvironmentFile=/etc/caddy/caddy.env` (already present in `caddy.service.d/override.conf`). **Risk:** the unit will be lost again if the package is reinstalled without the file being tracked. Fix: add the service unit to the `caddy-conf` repo or rebuild the hubris1 package to include it.
+
 ### 2026-04-28 — wiki entry created
 Initial documentation. 16 active sites at this date.