fix: add flake.lock back and update host configs
- Added `flake.lock` to pin dependencies (nixpkgs, home-manager, nixvim, flake-utils, etc.)
- Cleaned up `.gitignore`: stop ignoring `*.lock`
- Removed unused `flake-utils.inputs.nixpkgs.follows`
- Nixstation host:
- Removed `keychron.nix`, Wacom tablet config, and redundant session variables
- Simplified GDM/GNOME configuration and XKB layout
- Commented out virtualisation setup
- Common NVIDIA host config:
- Added explicit kernel modules, parameters, blacklists, and kernel version
- Ensured GNOME + GDM configuration present
- Updated NVIDIA driver settings and CUDA support
Thiago Sposito
ea25b5b515