Unify the front-end UI shell across the theta42 apps

views/top.ejs, views/bottom.ejs and public/lib/js/app-base.js are now
byte-identical across sso-manager-node, proxy and jump-host. Everything
per-app moved into utils/ui.js, exposed to every render as `ui` via
app.locals (nav items + their group gates, footer repo/docs/ToS links,
favicon, profile/logout targets, update-banner on/off + label).

Client framework changes:
- One gating model everywhere: app-base.js reveals .group-required-<cn>
  for each of the current user user/me groups. sso-manager-node sends LDAP
  DNs in memberOf, the OIDC clients send CNs in groups; both normalise to
  CNs, and the clients isAdmin flag becomes a synthetic `admin` group, so
  proxy nav-admin items are now group-required-admin.
- user/me is fetched once per page load and cached (app.auth.loadUser);
  nav, forceLogin and group-required elements all read that one promise.
- isLoggedIn is dual-mode (Promise + node-style callback), so the async
  and callback call styles both work from one shared top.ejs.
- forceLogin no longer uses $.holdReady (removed in jQuery 4): it redirects
  to /login?redirect=<path>, and still enforces required groups.
- logOut only clears the session; the caller decides where to go next.
- post/put/delete are dual-mode Promise/callback, which also removes the
  undefined `callback2` reference that threw on a non-function callback.

Dependencies: jquery ^4.0.0 and ejs ^3.1.10 in all three apps.

proxy specifics:
- .group-required base rule added to styles.css; the admin nav items lost
  their inline display:none in favour of it.
- The brand link points at / instead of #.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

nodejs/utils/ui.js

@@ -0,0 +1,45 @@
+'use strict';
+
+// Per-app values for the shared UI shell (views/top.ejs + views/bottom.ejs).
+//
+// Those two partials are byte-identical across sso-manager-node, proxy and
+// jump-host — everything that differs between the apps lives here and is
+// exposed to every render as `ui` via app.locals (see app.js). Keep the key set
+// in sync across the three apps; a missing key is a render-time ReferenceError,
+// not a silent fallback.
+
+module.exports = {
+	// --- footer -------------------------------------------------------------
+	repoUrl: 'https://github.com/theta42/proxy',
+	licenseUrl: 'https://github.com/theta42/proxy/blob/master/LICENSE',
+	// In-app docs route (routes/docs.js). Apps without one point at the
+	// published docs site and set docsExternal.
+	docsUrl: '/docs',
+	docsExternal: false,
+	// Only sso-manager-node serves a Terms of Service page; null hides the link.
+	tosUrl: null,
+
+	// --- header / nav -------------------------------------------------------
+	faviconUrl: '/static/favicon.svg',
+	// Where the current-user chip links. null renders it as a plain span (for
+	// apps with no profile page).
+	profileUrl: '/profile',
+	// Where "Log Out" lands.
+	logoutRedirect: '/',
+	// Admin-only "a newer release is available" banner, backed by
+	// GET /api/update-check. Apps without that endpoint set false.
+	updateCheck: true,
+	updateLabel: 'the proxy',
+
+	// Nav items, in order. `groups` is an OR-list of group CNs that may see the
+	// item; an empty list means "always visible". Gating is done client-side by
+	// app-base.js, which reveals .group-required-<cn> for each group the user is
+	// in (plus the synthetic `admin` group when user/me reports isAdmin).
+	nav: [
+		{href: '/hosts', icon: 'fa-solid fa-network-wired', label: 'Hosts', groups: []},
+		{href: '/dns', icon: 'fa-solid fa-record-vinyl', label: 'DNS', groups: []},
+		{href: '/users', icon: 'fa-solid fa-users', label: 'Users', groups: ['admin']},
+		{href: '/permissions', icon: 'fa-solid fa-user-shield', label: 'Permissions', groups: ['admin']},
+		{href: '/groups', icon: 'fa-solid fa-users-gear', label: 'Groups', groups: ['admin']},
+	],
+};