feat(console): add environment sessionVariables and custom TTY font/color configurations

[FixeQD]

Ported standard NixOS options for global session variables and virtual console styling to finix.
It implements environment.sessionVariables via profile.d/session-vars.sh, adds support for loading custom virtual console fonts and TTY color palettes and includes an earlySetup option to load console fonts straight inside the initrd stage

[Copilot]

Pull request overview

This PR ports NixOS-like configuration to finix for (1) globally exported session variables and (2) virtual console styling (fonts and 16-color palette), including an option to set the console font during initrd.

Changes:

• Add environment.sessionVariables and generate /etc/profile.d/session-vars.sh to export them for login shells.
• Extend hardware.console with console font, extra font/keymap packages, initrd early font setup, and optional TTY color palette configuration.
• Add a finit console-setup task to apply font/colors during boot.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
modules/hardware/console.nix	Adds console font/package/color options, initrd font support, and a finit task for applying console styling.
modules/environment/shells/default.nix	Adds environment.sessionVariables and generates a /etc/profile.d/ script to export them in login shells.

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