added metadata to flake, fixed darwin ghostty issue

not really, ghostty is broken on darwin systems

flake.nix

@@ -29,6 +29,8 @@
       inherit userName userEmail ghostty;
     };
   in {
+    meta = import ./meta;
+
     # Primary laptop - MacBook Pro (2023, M3)
     darwinConfigurations."sephiroth" = darwin.lib.darwinSystem {
       system = "aarch64-darwin";