Add Copilot instructions, update flake.lock, and enhance Nix configurations

- Introduced Copilot instructions for better project understanding.
- Updated flake.lock with new dependency revisions and hashes.
- Modified zen.nix to include tracking protection and native messaging hosts.
- Added godot.nix for Godot language support in VSCode.
- Enhanced kde.nix with additional system packages and session variables.
- Created thunderbolt.nix to enable Thunderbolt services.
- Updated Bellerophon default.nix to include thunderbolt.nix.
- Adjusted hardware-configuration.nix to include new kernel modules and parameters.

hosts/common/optional/thunderbolt.nix

@@ -0,0 +1,8 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  services.hardware.bolt.enable = true;
+}