Enable swiching default VM between console and gui.

[vic]

Edit modules/vm.nix

Closes #82

[Copilot]

Pull Request Overview

This PR refactors the VM configuration to enable switching between GUI and console (TUI) variants. The main change introduces a modular structure where VM configurations can be composed with either graphical or text-based installers, making it easy to toggle between modes by commenting/uncommenting a single line.

• Refactored eg.vm-bootable to provide both gui and graphical-base variants using a parameterized installer function
• Created new eg.vm aspect that composes VM configurations with appropriate bootable installers and desktop environments
• Moved VM variant selection from igloo.nix to a centralized configuration in vm.nix

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
templates/default/modules/vm.nix	Added parameters and configured to use eg.vm._.gui variant (with tui option commented out)
templates/default/modules/aspects/igloo.nix	Removed hardcoded VM and desktop includes, delegated to vm.nix
templates/default/modules/aspects/eg/vm.nix	New file defining composable VM variants (gui/tui) with appropriate bootable installers
templates/default/modules/aspects/eg/vm-bootable.nix	Refactored to use parameterized installer function supporting minimal (tui) and graphical-base (gui) variants
templates/default/modules/aspects/defaults.nix	Added OS parameter with deadnix skip annotation for compatibility
templates/default/flake.lock	Updated den dependency to newer version

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