Bind the backend to 0.0.0.0:9119 in dashboard mode so the web UI is
reachable from the local network, open the port in the firewall, and
add dashboard username/password credentials to the mibook hermes-env
secret.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sux8hmeb2qadqPqbJ1zNzL
Proves the sops-nix pipeline end to end on mibook: encrypts a
throwaway secret to the operator + mibook host keys, declares it in
machines/mibook/secrets.nix, and verifies it decrypts to
/run/secrets/placeholder (root:root, 0400) on nixos-rebuild switch.
Also removes the dead `let secrets = config.sops.secrets;` binding
from both environments.nix files — leftover from an earlier abandoned
plan, never referenced.