kdePackages.kajongg: remove broken package

kajongg has been marked broken since NixOS 24.05 and remains unfixed.
The package is actually a Python app that needs significant work to
fix properly.

Per RFC 180, packages broken for a full release cycle are subject
to removal.

NixOS/rfcs#180

Author: Mic92

pkgs/kde/gear/default.nix

@@ -50,7 +50,7 @@
   kaccounts-integration = callPackage ./kaccounts-integration { };
   kaccounts-providers = callPackage ./kaccounts-providers { };
   kaddressbook = callPackage ./kaddressbook { };
-  kajongg = callPackage ./kajongg { };
+
   kalarm = callPackage ./kalarm { };
   kalgebra = callPackage ./kalgebra { };
   kalk = callPackage ./kalk { };
@@ -249,4 +249,7 @@
   umbrello = callPackage ./umbrello { };
   yakuake = callPackage ./yakuake { };
   zanshin = callPackage ./zanshin { };
+
+  # Removed packages
+  kajongg = throw "kdePackages.kajongg has been removed due to being broken for more than a year; see RFC 180"; # Added 2026-02-05
 }