- Add dns.nix: environment-specific DNS domain, name servers, forwarders
- Add time.nix: NTP servers (gateway), timezone, hardware clock
- Add proxy.nix: placeholder for future proxy settings (no proxy for now)
- Add smtp.nix: SMTP relay configuration for system emails
- Add default.nix: unified entry point for all network parameters
These files allow environment-specific settings to be managed in one place
and imported by host configurations.
