Add super/jump admin, per-host connection tracking; move stats to Audit

- app_super_admin (cross-app, also recognized by sso-manager-node/proxy)
  and a new app_jump_admin group are added to conf.auth: super admins are
  full admins here same as app_sso_admin; jump admins get audit page/data
  access without other admin rights (isJumpAdmin/requireJumpAdmin in
  middleware/auth.js, wired into routes/api.js's audit-data gate and the
  /audit page's client-side forceLogin -- previously the page shell
  rendered for any logged-in user, only the data was gated).
- Dashboard: moved the stat boxes and Top hosts/Top users cards to the
  Audit page (audit is now the admin-facing metrics home; dashboard stays
  focused on "hosts I can reach"). Renamed "All hosts" to "My hosts".
- Host list now shows Last connection/Last failed connection columns and
  highlights rows green (live session, from session_registry) or yellow
  (most recent attempt failed) -- backed by new per-host last-success/
  last-fail timestamps in models/metrics.js, populated by ssh_server.js
  (which now attributes grammar/TUI connect failures to the resolved host
  when one was found, not just aggregate counters) and surfaced through
  GET /api/user/hosts (routes/user.js).

nodejs/routes/user.js

@@ -4,14 +4,17 @@
 // browser who it is and whether it's an admin (drives login state + nav).
 
 const router = require('express').Router();
-const { isAdmin } = require('../middleware/auth');
+const { isAdmin, isJumpAdmin } = require('../middleware/auth');
 const access = require('../utils/access');
+const metrics = require('../models/metrics');
+const registry = require('../services/session_registry');
 
 router.get('/me', (req, res) => {
 	res.json({
 		username: req.user && req.user.username,
 		groups: req.groups || [],
 		isAdmin: isAdmin(req),
+		isJumpAdmin: isJumpAdmin(req),
 	});
 });
 
@@ -23,7 +26,20 @@ router.get('/hosts', async (req, res, next) => {
 		const hosts = isAdmin(req)
 			? await access.allHosts()
 			: await access.accessibleHosts({ uid: req.user && req.user.username, groups: req.groups || [] });
-		res.json({ results: hosts });
+
+		// Enrich with connection state for the dashboard's host list: whether a
+		// session is live right now (active bridges, session_registry), plus the
+		// last successful/failed connection times (models/metrics).
+		const connectedSlugs = new Set(registry.list().map((s) => s.slug));
+		const last = await metrics.lastForHosts(hosts.map((h) => h.slug));
+		const enriched = hosts.map((h) => ({
+			...h,
+			connected: connectedSlugs.has(h.slug),
+			lastConnected: (last[h.slug] && last[h.slug].lastConnected) || null,
+			lastFailed: (last[h.slug] && last[h.slug].lastFailed) || null,
+		}));
+
+		res.json({ results: enriched });
 	} catch (err) { next(err); }
 });