Web UI HTTP/3 , Option to change `max-age` in `Alt-Svc`

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) 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

### Operating system type

Linux, Other (please mention the version in the description)

### CPU architecture

AMD64

### Installation

Docker

### Setup

On one machine

### AdGuard Home version

v0.108.0-b.17

### Description

#### What did you do?
https://github.com/AdguardTeam/AdGuardHome/issues/4986 let the browser know that the server supports `h3` by adding `Alt-Svc` header, default value of `24h` is taken by defauly
#### Expected result
Ability to set `max-age` for `Alt-Svc` in config file
#### Actual result

#### Screenshots (if applicable)

#### Additional information