To implement one-click buttons for native applications in Coder Desktop, we need to refactor how (SSH) hostnames are handled⁠.

Currently, Coder uses a hostname prefix for SSH configuration, but this approach is incompatible with Coder Desktop which requires a suffix-based approach. This refactoring is necessary to enable seamless deep linking and native application launches⁠⁠.

Tasks include:

• Deprecate the existinghostname prefix option⁠⁠
• Implement a new hostname suffix option to be used by the config-ssh command and Coder Desktop (e.g.,HostnameSuffix, defaulting tocoder)⁠
• Update the config-ssh subcommand to reflect these changes⁠⁠
• Dynamically configure VPN DNS settings & workspace hostnames based on the hostname suffix