Allow DNS protocol selection for existing DNS servers

### Issue Details

Mobile AdGuard VPN apps allow users to select a DNS protocol for pre-defined servers, while the macOS app does not.

<details><summary>Desktop:</summary>

<img width="706" height="362" alt="Image" src="https://github.com/user-attachments/assets/23f2fdd1-3d5f-4bad-855c-39c2a08a6703" />

</details>

<details><summary>Mobile:</summary>

<img width="706" alt="Image" src="https://github.com/user-attachments/assets/ba40570c-222a-4e3a-9b71-6a275fa18b6a" />

</details>


### Proposed solution

Allow users to select a protocol when choosing a DNS server from the pre-defined list

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Allow DNS protocol selection for existing DNS servers #464

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Allow DNS protocol selection for existing DNS servers #464

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