Adds a narrow, safelisted BFF surface so the Solace Bank Group PLC portal
(and other browser clients) can reach the Cloudflare Access protected
Proxmox API without requiring the user to complete a CF-Access SSO flow
in-browser.
Endpoints:
GET /api/proxmox/health — configuration probe (503 when unset)
GET /api/proxmox/cluster/status — aggregated cluster node status
Required orchestrator env:
PROXMOX_API_URL
PROXMOX_CF_ACCESS_CLIENT_ID
PROXMOX_CF_ACCESS_CLIENT_SECRET
When env is missing the endpoints return 503 with an actionable JSON
body and the frontend stays in its mocked state — no crashes, no
partial deploys.