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.

sso-manager-node specifics:
- val.js adopts the shared superset (adds the target/hostname rules and
  the password policy, and fixes the let-shadowed `message` that stopped
  custom rule messages from reaching validateMessage).
- GET /api/user/me now also reports isAdmin (membership in app_sso_admin).
- public/js/app.js: $.isFunction -> typeof (removed in jQuery 4).

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

nodejs/routes/user.js

@@ -74,7 +74,17 @@ router.delete('/:uid', async function(req, res, next){
 
 router.get('/me', async function(req, res, next){
 	try{
-		return res.json(await User.get({uid: req.user.uid}));
+		const user = JSON.parse(JSON.stringify(await User.get({uid: req.user.uid})));
+
+		// The shared client framework gates the UI on a single effective-rights
+		// flag (the OIDC-client apps send the same key). Here "admin" means
+		// membership in app_sso_admin; group-level gating still reads memberOf.
+		const groups = (user.memberOf || []).map(function(dn){
+			return String(dn).split(',')[0].replace(/^cn=/i, '');
+		});
+		user.isAdmin = groups.includes('app_sso_admin');
+
+		return res.json(user);
 	}catch(error){
 		next(error);
 	}