optimistic dns caching

### 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

GitHub releases or script from README

### Setup

On a router, DHCP is handled by the router

### AdGuard Home version

v0.107.44

### Action

optimistic dns caching enabled, dns cache size doubled, minimal ttl 60 seconds (maximal ttl is empty)

### Expected result

expecting of reduction of latency for all dns requests after first resolution

### Actual result

one request of 20 or 30 on average resolves es expected (under 10 ms)
all else obviously requests each time clients request it

### Additional information and/or screenshots

_No response_