Fix pytest import path

Fix flake8 errors

Update README

Add summarization model

Add app package

Add requirements

fix: use TestClient as context manager to trigger lifespan #2

fix: use TestClient as context manager to trigger lifespan

Правка flake8 #2

Правка flake8

Запрос на слияние 'feature/readme' (#3) из feature/readme в main

update README with setup and run instructions

add Streamlit UI for sentiment analysis