feat(desktop): add auto-update via electron-updater + manual CI trigger

desktop/package.json

@@ -18,6 +18,7 @@
     "dist:win": "npm run build && electron-builder --win"
   },
   "dependencies": {
+    "electron-updater": "^6.8.9",
     "highlight.js": "^11.11.1",
     "lucide-react": "^1.21.0",
     "markdown-it": "^14.2.0",
@@ -63,7 +64,8 @@
         {
           "target": "dmg",
           "arch": [
-            "arm64"
+            "arm64",
+            "x64"
           ]
         }
       ]
@@ -84,6 +86,11 @@
       "allowToChangeInstallationDirectory": true,
       "createDesktopShortcut": true,
       "createStartMenuShortcut": true
+    },
+    "publish": {
+      "provider": "github",
+      "owner": "zhayujie",
+      "repo": "chatgpt-on-wechat"
     }
   }
 }