Add Avahi mDNS hostName override and Caddy .local block for sovransystemsos.local LAN access

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/ca3945d7-a2cb-4121-bd89-a5e3fe31fc47

Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

modules/core/caddy.nix

@@ -145,6 +145,14 @@ $HAVEN {
 EOF
       fi
 
+      # ── Sovran Hub (LAN access via mDNS) ────────────
+      cat >> /run/caddy/Caddyfile <<EOF
+
+http://sovransystemsos.local {
+  reverse_proxy localhost:8937
+}
+EOF
+
       # ── RTL (LAN access) ────────────────────────────
       cat >> /run/caddy/Caddyfile <<EOF