DC AMD Proxy pairing

Use only after the NAS dc-amd-proxy service is deployed and reports
state=awaiting_pair.

Open PowerShell on the AMD machine and run:

powershell -NoProfile -ExecutionPolicy Bypass -File .\pair-dc-amd-proxy.ps1

The script reads the connector credential only inside the local Docker
container, sends it once to the NAS LAN address, and does not print it.