Finder integration not available on macOS Sequoia (15.x) even with VFS-enabled installer

### Expected behavior

When installing the official macOS VFS-enabled package (`Nextcloud-3.16.6-macOS-vfs.pkg`) on macOS Sequoia (version 15.5), Finder integration and virtual files support should be available.

### Actual behavior

- No Finder extension is registered (checked with `pluginkit`)
- No "Use virtual files" option is shown during account setup
- Nothing appears under System Settings > Extensions > Finder
- No prompt to enable Finder integration was shown during install

### Steps to reproduce

1. Use macOS Sequoia 15.5 (developer or public beta)
2. Install `Nextcloud-3.16.6-macOS-vfs.pkg`
3. Launch the app and check for virtual files options or Finder integration
4. Run `pluginkit -m -A -i com.nextcloud.desktopclient` – shows no result

### System information

- macOS Sequoia 15.5 (build 24F74)
- Nextcloud client version: 3.16.6 (VFS-enabled)
- Intel/Apple Silicon: Apple Silicon (M3)
- Nextcloud server: 31.0.6 (Docker)
- `'files_on_demand.enabled' => true` added to config.php

### Notes

Finder integration works properly on macOS Ventura and Sonoma with the same installer. This issue seems specific to Sequoia.

Please confirm if this is a known limitation or if additional steps are required for Finder extension registration on macOS 15.