Binding to address 0.0.0.0 also binds to IPv6 interfaces

### Prerequisites

- [x] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a) and found no answer

- [x] I have searched other issues and found no duplicates

- [x] I want to report a bug and not [ask a question or ask for help](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a)

- [x] I have set up AdGuard Home correctly and [configured clients to use it](https://github.com/AdguardTeam/AdGuardHome/wiki/Clients). (Use the [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a) for help with installing and configuring clients.)

### Platform (OS and CPU architecture)

FreeBSD, AMD64 (aka x86_64)

### Installation

Custom package (OpenWrt, HomeAssistant, etc; please mention in the description)

### Setup

Other (please mention in the description)

### AdGuard Home version

0.107.69

### Action

Hi,

I'm running Adguard Home on a FreeBSD jail as nameserver. DHCP and other stuff is handled by other machines.

When binding DNS to IP 0.0.0.0 Adguard Home also listens on IPv6 addresses.

```yaml
dns:
bind_hosts:
- 0.0.0.0
port: 53
```

Log:
```txt
2026/03/09 13:43:14.491528 [info] dnsproxy: starting dns proxy server
2026/03/09 13:43:14.491544 [info] dnsproxy: creating udp server socket addr=0.0.0.0:53
2026/03/09 13:43:14.491665 [info] dnsproxy: listening to udp addr=[::]:53
2026/03/09 13:43:14.491672 [info] dnsproxy: creating tcp server socket addr=0.0.0.0:53
2026/03/09 13:43:14.491694 [info] dnsproxy: listening to tcp addr=[::]:53
2026/03/09 13:43:14.491772 [info] dnsproxy: entering udp listener loop addr=[::]:53
2026/03/09 13:43:14.491787 [info] dnsproxy: entering listener loop proto=tcp addr=[::]:53
```

### Expected result

If I want Adguard Home to listen on IPv6 interfaces I would assume that I have to activate it:
```yaml
dns:
bind_hosts:
- 0.0.0.0
- '::'
port: 53
```

### Actual result

-

### Additional information and/or screenshots

_No response_