feat: Agents page + secure /api/agent REST (v1.22.0)

- New admin Agents page (nav + /agents route + views/agents.ejs): live list of
  connected theta-agent hosts with CPU/RAM/disk/ZFS/GPU telemetry and online
  status, updated live over socket.io ('agent.telemetry'/'agent.discovery').
- Auth + admin-gate the /api/agent REST router (it was mounted without
  middleware.auth — anyone could list nodes / send commands). The agent
  WebSocket (/api/agent/ws) is unaffected (handled by the raw wss upgrade with
  its own token auth).
- package.json + lockfile bumped to 1.22.0 to match the tag.

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

nodejs/utils/ui.js

@@ -46,6 +46,7 @@ module.exports = {
 		{href: '/directory', icon: 'fa-solid fa-server', label: 'Directory', groups: ['app_sso_admin', 'app_sso_directory_admin', 'admin']},
 		// Vault requires login - per-user secrets at secret/users/<uid>/*.
 		{href: '/vault', icon: 'fa-solid fa-vault', label: 'Vault', groups: ['login']},
+		{href: '/agents', icon: 'fa-solid fa-microchip', label: 'Agents', groups: ['app_sso_admin', 'admin']},
 		{href: '/overview', icon: 'fa-solid fa-gauge-high', label: 'Overview', groups: ['app_sso_admin', 'admin']},
 	],
 };