WG Paid multi-protocol read-only current-state register

VM121:
- backend health: PASS
- DB health: PASS
- Alembic: unknown
- users/subscriptions/peers: unknown/unknown/unknown
- pending/failed jobs: unknown/unknown
- active selector helper: false

VM100:
- wg_paid present/peers: true/5
- selector entries: 5
- AmneziaWG CLI/packages: true/3
- awg_paid present: false
- candidate port collision: false
- candidate pool conflict: false

VM101:
- existing WG DNAT: true
- candidate AWG public port collision: false
- candidate AWG DNAT already present: false

This file records facts only. Architectural conclusions are made after review.