feat: add some stuff to openclaw

modules/base/home-manager.nix

@@ -11,5 +11,6 @@
     home-manager.users.${config.flake.meta.user.name} = {
       home.stateVersion = config.flake.meta.stateVersion;
     };
+    home-manager.backupFileExtension = "hm-bak-";
   };
 }

modules/server/openclaw.nix

@@ -21,6 +21,8 @@ in {
 
     environment.systemPackages = with pkgs; [
       whisper-cpp
+      libqalculate
+      gh
     ];
   };
 
@@ -43,10 +45,9 @@ in {
       };
       bundledPlugins = {
         summarize.enable = true; # Summarize web pages, PDFs, videos
-        sag.enable = false; # Text-to-speech
-        gogcli.enable = false; # Google Calendar
+        sag.enable = true; # Text-to-speech
+        gogcli.enable = true;
         goplaces.enable = true; # Google Places API
-        bird.enable = false; # Twitter/X
       };
     };