Add a hermes-dashboard compose service that runs 'hermes dashboard' on
0.0.0.0:9119 with HTTP basic auth. The username + scrypt password hash
live in the git-ignored /home/dank/hermes-data config (plaintext never
stored). A separate container from the Signal gateway, since the gateway
entrypoint does not start the dashboard. Both share the data volume and
are boot-persistent. Docs page + index link added (docs-first contract).
Frank
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