Enable Evolution module and bind shortcut

Add core/evolution.nix with a toggleable option and import it in the
core
defaults. Enable the option on desktop, laptop, and default hosts.
Remove
the duplicated evolution‑data‑server enable flag from services.nix. Add
a
Hyprland keybinding (Super Shift E) to launch Evolution.

modules/core/evolution.nix

@@ -0,0 +1,12 @@
+{
+  lib,
+  config,
+  ...
+}: {
+  options.evolution.enable = lib.mkEnableOption "Enable Evolution";
+
+  config = {
+    programs.evolution.enable = lib.mkIf config.evolution.enable true;
+    services.gnome.evolution-data-server.enable = lib.mkIf config.evolution.enable true;
+  };
+}