API endpoint to query blocking decision for a domain (including service blocking)

### 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 request a feature or enhancement and not ask a question

### The problem

AdGuard Home exposes an API endpoint (`/control/filtering/check_host`) which can be interacted via `Filters > Custom filtering rules > Check the filtering` to query whether a domain/hostname is blocked, but this only checks the filter lists and not the blocked services.

### Proposed solution

Add a new HTTP API endpoint that evaluates a given domain/hostname against AdGuard Home's full decision pipeline and returns the result (blocked or allowed).

### Alternatives considered and additional information

_No response_