Close the last three UI leftovers: shared staff HTML, cookie domain, stock Swagger label.

verae-staff-ui holds one review template for CS and access-staff.
Staff cookies take STAFF_COOKIE_DOMAIN for a reverse-proxy host.
/docs stays vendor Swagger with an integrator banner only.

packages/verae-staff-session/README.md

@@ -7,3 +7,25 @@ Shared cookie login for CS / sales / accounting / access-staff HTML.
 Port `:3027`. Set `STAFF_AUTH=1` on the department servers and `STAFF_SESSION_URL=http://127.0.0.1:3027`. Cookie host is the browser host (ports share `127.0.0.1`). JSON APIs stay open unless you also send `x-staff-key`.
 
 Default key: `STAFF_KEY` or `ADMIN_KEY` or `admin-dev-key`.
+
+## Multiple hostnames
+
+Cookies are host-scoped. On one operator box (`127.0.0.1`) that is enough. For several DNS names, put one reverse proxy in front and set `STAFF_COOKIE_DOMAIN`:
+
+```nginx
+server {
+  server_name staff.example.com;
+  location /session/ { proxy_pass http://127.0.0.1:3027/; }
+  location /cs/      { proxy_pass http://127.0.0.1:3011/; }
+  location /sales/   { proxy_pass http://127.0.0.1:3012/; }
+  location /acct/    { proxy_pass http://127.0.0.1:3013/; }
+  location /staff/   { proxy_pass http://127.0.0.1:3025/; }
+}
+```
+
+```bash
+STAFF_COOKIE_DOMAIN=.example.com
+STAFF_COOKIE_SECURE=1
+STAFF_SESSION_URL=https://staff.example.com/session
+STAFF_AUTH=1
+```