[HoneyBearTech]

Adds USAS (https://github.com/HoneyBearTech/ubuntu-server-auto-setup), a self-hosted web UI and set of
Ansible playbooks that install Ubuntu Server on new Proxmox VE VMs unattended and apply a hardened
baseline, as an enhanced app.

• Endpoint: GET /api/status, documented in USAS's docs/interfaces.md ("The status API"). It returns a
  short summary only: the running run's playbook, the last run's playbook and result, the inventory's
  servers still to install, and the cluster's running/total VMs. It never holds host, node, cluster or
  VM names, addresses, VM IDs, logs or secrets.
• Auth: Authorization: Bearer . The API is off (404) until the token is made in USAS on
  the Account page, under "Status for dashboards"; the token can read this summary and nothing else.
  The config field is a password input.
• Tile: Run / VMs / New. "Run" shows the last run's result (OK, Failed, Stopped), or "Now" with the
  playbook while a run is going. Status is "active" while a run is in progress (5 s refresh),
  otherwise 30 s. Unknown values in the answer are ignored, so the tile only ever shows its own labels.

Test plan: tested against a self-hosted USAS (v0.6.0) in linuxserver/heimdall (2.8.3). Test says
"Successfully communicated with the API" with a valid token; the tile showed "Run OK, VMs 10/11, New 2",
and "Now Install" during a provisioning run.