feat: initial jump-host — SSH jump host for the theta42 stack

An SSH jump host that authenticates users against the shared LDAP
directory, authorizes them from the SSO Manager's inventory graph, and
bridges them to downstream hosts — auditing everything.

- Username-grammar routing (uid_-_target@jump) + interactive TUI picker
- Inbound LDAP auth (publickey / password with off|local|all policy)
- Directory-driven access (LDAP groups x /api/discovery/resources?group=)
- Per-user key injection into sshPublicKey, connects downstream as the user
- Shell / exec / SFTP-subsystem bridging (WinSCP works)
- Web UI + HTTP API (:3002) for audit + metrics; LDAP-admin gated
- Packaged like proxy: ops/install.sh + systemd, all-in-one Docker, compose
- Tests: 23 unit + 3 integration (node --test), all green

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

nodejs/models/session.js

@@ -0,0 +1,42 @@
+'use strict';
+
+// Web UI sessions — a signed-in admin's browser token. model-redis Table with
+// a TTL so entries expire and survive restarts.
+
+const crypto = require('crypto');
+const Table = require('.');
+
+class Session extends Table {
+	static _key = 'token';
+	static _keyMap = {
+		'token':      {default: function(){ return crypto.randomUUID() }, type: 'string'},
+		'uid':        {isRequired: true, type: 'string'},
+		'groups':     {default: '[]', type: 'string'},
+		'created_on': {default: function(){ return (new Date).getTime() }},
+		'expires_at': {default: 0, type: 'number'},
+	}
+}
+
+Session.register();
+
+Session.start = async function (uid, groups, ttlMs) {
+	return Session.create({
+		uid,
+		groups: JSON.stringify(groups || []),
+		expires_at: Date.now() + ttlMs,
+	}, { ttl: Math.ceil(ttlMs / 1000) });
+};
+
+Session.verify = async function (token) {
+	if (!token) return null;
+	let session;
+	try {
+		session = await Session.get(token);
+	} catch (_) {
+		return null;
+	}
+	if (!session || session.expires_at < Date.now()) return null;
+	return session;
+};
+
+module.exports = Session;