docs(hermes,dns): document the new internal-only exposure surface

Post-change doc reconciliation for the hermes vhosts + DNS deletion batch:

- Hermes-Dashboard.md: access is now the hermesadmin.franksdank.cloud vhost
  (direct Caddy proxy to 192.168.0.143:9119, no guard chain — exempt because the
  dashboard enforces its own basic-auth login), plus the raw LAN port. The old
  text claimed an Authentik-guarded public vhost, which was decommissioned.
- Hermes-WebUI.md: description updated — the webui is now also reachable via the
  unguarded hermes.franksdank.cloud vhost (its own password auth is the gate).
- LAN-DNS.md: "add a name in two places" corrected to a two-or-three-step
  decision; internal-only names (prometheus/loki/grafana/seerr) deliberately get
  no public A record and resolve on the LAN only, and DNS-01 issuance is
  unaffected because the challenge is a TXT record in the same zone.
- Seerr.md: DNS row corrected — addn-hosts only since 2026-09-02; NXDOMAIN on WAN.
- hermes-dashboard.container: unit comment no longer claims Authentik termination.

No behavior change in this commit; tests 233/233 green (docs-completeness seam included).

serverAppConfigs-docs/Dankclaw/Hermes-WebUI.md

@@ -1,7 +1,7 @@
 ---
 type: configuration
 title: Hermes-WebUI (Hermex server)
-description: The hermes-webui container on Dankclaw — the API server that the Hermex iPhone app talks to, reachable over an SSH tunnel and, because it binds all interfaces, from the whole LAN.
+description: The hermes-webui container on Dankclaw — the API server that the Hermex iPhone app talks to, reachable over an SSH tunnel, from the whole LAN (it binds all interfaces), and from https://hermes.franksdank.cloud (internal-only vhost).
 tags:
   - hermes
   - hermes-webui