basic academic teacher API

## Summary
Create an endpoint returning basic academic teacher information (personal data, contact) based on the architecture defined in ADRs. Initially, data comes from a single base source.

## [Acceptance criteria](https://www.atlassian.com/work-management/project-management/acceptance-criteria)
- [x] Create a basic `AcademicTeacher` aggregate with necessary properties (id, name, title, photo url, email, phone)
- [x] Implement a `Slug` property, generated upon entity creation and saved in the database (with a `UNIQUE` constraint). Should be immutable to avoid 404 errors on frontend.
- [x] Create a query and handler returning the profile via a single endpoint.
- [x] Following the handler bypasses the Domain layer and directly uses `DbContext` with `.AsNoTracking()` to map data to a flat DTO.
- [x] The returned data omits the academic teacher's courses, opinions, consultations, and timetable sections for now.

## Notes
here is the structure that we agreed to return from api:
```
{
"id": 2137,
"slug": "jan-kowalski",
"base_info": {
"name": "Jan Kowalski",
"title": "dr inż.",
"photo_url": "https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fimg.freepik.com%2Fpremium-photo%2Fmen-different-ethnicities-showcase-unique-facial-expressions-emotions_862489-54692.jpg%3Fw%3D996&f=1&nofb=1&ipt=5fb8cb59427f0c22a38802fc4c853ddd315724b0af4a33366072eae97d698ad2"
},
"contact": {
"email": "jan.kowalski@example.com",
"phone": "+48 600 123 456",
"website": "https://github.com/akai-org/put-wiki/issues"
},
"description": "Doktor inżynier specjalizujący się w programowaniu, bazach danych oraz projektowaniu systemów informatycznych. Prowadzi zajęcia zarówno teoretyczne, jak i praktyczne.",
"opinions": [
{
"ocena": 5,
"tresc": "Bardzo dobry prowadzący, wszystko jasno tłumaczy i chętnie odpowiada na pytania."
},
{
"ocena": 4,
"tresc": "Ciekawe zajęcia i dobrze przygotowane materiały."
},
{
"ocena": 5,
"tresc": "Bardzo pozytywne podejście do studentów. Polecam."
}
],
"consultations": {
"time": "14:00-16:00",
"interval": "co tydzień",
"weekday": "czwartek",
"place": "Budynek A, pokój 204",
"last_updated": "13.02.2021"
},
"lecturers_courses": [
{
"nazwa": "Programowanie obiektowe",
"semestr": 3,
"typ": "wykład"
},
{
"nazwa": "Bazy danych",
"semestr": 4,
"typ": "laboratorium"
},
{
"nazwa": "Inżynieria oprogramowania",
"semestr": 5,
"typ": "projekt"
}
],
"timetable": [
{
"day": "Poniedziałek",
"time": "10:15-12:00",
"przedmiot": "Programowanie obiektowe",
"sala": "A-101",
"typ": "wykład"
},
{
"day": "Wtorek",
"time": "08:00-09:45",
"przedmiot": "Bazy danych",
"sala": "B-203",
"typ": "laboratorium"
},
{
"day": "Środa",
"time": "12:15-14:00",
"przedmiot": "Inżynieria oprogramowania",
"sala": "C-105",
"typ": "projekt"
}
]
}
```