feat(home/git.nix): enable Git LFS and add aliases

- Enabled Git Large File Storage (LFS)
- Added `ai` alias to generate diff with AI chat

roles/home/git.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, lib, ... }: {
+{ pkgs, ... }: {
   programs.git = {
     enable = true;
     userName = "Giulio De Pasquale";
@@ -12,6 +12,10 @@
       };
     };
     delta.enable = true;
+    lfs.enable = true;
+    aliases = {
+      ai = ''! cd -- "''${GIT_PREFIX:-.}" && git diff HEAD -- "$@" | aichat -m ollama:pino-coder -r commitmessage #'';
+    };
   };
   home.packages = [ pkgs.git-lfs ];
 }