Remove maker-zip from Electron build (only Squirrel needed)

Fix CI: zip binary not available in builder image, and we only
distribute via Squirrel installer anyway.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

electron/forge.config.js

@@ -1,5 +1,3 @@
-const path = require('path');
-
 module.exports = {
   packagerConfig: {
     name: 'Gaming Hub',
@@ -13,9 +11,5 @@ module.exports = {
         name: 'gaming-hub-desktop',
       },
     },
-    {
-      name: '@electron-forge/maker-zip',
-      platforms: ['win32', 'linux', 'darwin'],
-    },
   ],
 };