Effective configuration viewer

On a trusted reverse-proxy page, the Host desktop's Open configuration file action is replaced with View effective config:

It reads namespace values resolved by the running DSH process through the existing settings.describe() boundary.
It supports YAML / JSON views, refresh, and copy.
Keys, tokens, and passwords remain redacted by the DSH server-side schema. The plugin never reads or returns the raw settings.yaml document.
The view represents effective values, not the source file's comments or original formatting.

dsh-trusted-host-proxy-403-fix