gnome: custom logo menu + dconf defaults

- Patch Logo Menu v38 to custom entries incl. Containers (DistroShelf)\n- Switch GNOME defaults to programs.dconf profile\n- Add desktop overrides for Thunar->Files and Ghostty->Terminal\n- Enable Thunar integration (gvfs/tumbler/xfconf) and add virt-manager tooling

modules/system/base.nix

@@ -47,7 +47,11 @@
     ];
   };
 
-  services.openssh.enable = true;
+  services = {
+    openssh.enable = true;
+    gvfs.enable = true;
+    tumbler.enable = true;
+  };
 
   networking = {
     useDHCP = lib.mkDefault true;
@@ -62,7 +66,17 @@
       enableBashIntegration = lib.mkDefault true;
     };
     nix-index-database.comma.enable = lib.mkDefault true;
+    thunar = {
+      enable = true;
+      plugins = [
+        pkgs.xfce.thunar-archive-plugin
+        pkgs.xfce.thunar-media-tags-plugin
+        pkgs.xfce.thunar-vcs-plugin
+        pkgs.xfce.thunar-volman
+      ];
+    };
     virt-manager.enable = true;
+    xfconf.enable = true;
   };
 
   # Optimise the Nix store once a day