Nextcloud fails to start on fresh installations of Windows 11 because some DLLs are not signed, causing Smart App Control to block them

### ⚠️ Before submitting, please verify the following: ⚠️

- [x] This is a **bug**, not a question or a configuration issue.
- [x] This issue is **not** already reported on Github (I have searched for it).
- [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

The files `nextcloudsync_vfs_cfapi.dll` and `nextcloudsync_vfs_suffix.dll` are not signed and therefore blocked from loading on Windows 11 if Smart App Control is enabled.

Smart App Control is enabled by default on fresh installations of Windows 11.

### Steps to reproduce

1. Ensure Smart App Control in enabled on your version of Windows 11
2. Download the latest installer from https://nextcloud.com/install/#desktop-files
3. Click through the installer (set checkbox to Launch Nextcloud on the last page)
4. Get security warning from Windows, telling you that the DLLs have been blocked

### Expected behavior

Nextcloud starts without issues.

### Which files are affected by this bug

_No shared files was affected. The desktop app has not yet been configured._

### Operating system

Windows

### Which version of the operating system you are running.

Windows 11 Pro 25H2 (26200.8875)

### Installation method

Official Windows MSI

### Nextcloud Server version

_not connected to any server_

### Nextcloud Desktop Client version

33.0.7

### Did this occur after an update or on a clean installation?

Clean desktop client installation

### Are you using the Nextcloud Server Encryption module?

No

### Are you using an external user-backend?

- [x] Default internal user-backend
- [ ] LDAP or Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

```shell
_no server_
```

### Additional info

Client log: [20260722_2351_nextcloud.log](https://github.com/user-attachments/files/30285736/20260722_2351_nextcloud.log)

Start with the official Windows MSI installer and the two affected files, nextcloudsync_vfs_cfapi.dll and nextcloudsync_vfs_suffix.dll. Reproduce the clean-install failure on Windows 11 with Smart App Control enabled and inspect how these DLLs are included in the installer. Done means a fresh installation launches without Windows blocking either DLL.

Written by the indexing model from the issue text.