feat(emacs): enable copilot package and override attributes

- Added `copilot` to the AI package list in `default.nix`
- Introduced an override for `copilot` to customize its attributes

Author: takeokunn

home-manager/packages/emacs/default.nix

@@ -4,7 +4,11 @@
   sources,
 }:
 let
-  override = final: prev: { };
+  override = final: prev: {
+    copilot = prev.copilot.overrideAttrs (_: {
+      postPatch = "";
+    });
+  };
 in
 {
   emacs-git = pkgs.emacsWithPackagesFromUsePackage {

home-manager/packages/emacs/epkgs/packages/ai/default.nix

@@ -3,7 +3,7 @@
 }:
 with epkgs;
 [
-  # copilot
+  copilot
   copilot-chat
   ellama
   aidermacs