feat: add download all as zip feature

- Add adm-zip dependency for zip compression
- Add DownloadAllZipParams/Result IPC types
- Implement registerDownloadAllZip handler in main process
- Update frontend download flow with save dialog
- ZIP includes pc/, mobile/ folders and metadata.json

package.json

@@ -29,7 +29,9 @@
     "@electron-toolkit/utils": "^3.0.0",
     "@kintone/rest-api-client": "^6.1.2",
     "@lobehub/ui": "^5.5.1",
+    "@types/adm-zip": "^0.5.7",
     "@uiw/react-codemirror": "^4.23.0",
+    "adm-zip": "^0.5.16",
     "antd": "^6.1.0",
     "antd-style": "^4.1.0",
     "electron-store": "^10.0.0",