API testing with Playwright

Playwright's request fixture is a full API client — no separate tool needed:

• const res = await request.get('/api/users') — GET
• await request.post('/api/orders', { data: {...} }) — POST with a JSON body
• res.status(), await res.json() — status and body

Two usage scenarios:

• Pure API tests — fast contract/logic checks without the UI
• Hybrid tests — prepare data via API (fast), walk only the part under test in the UI: for "check the cart page as a user with an order", registration + order come from the API, only the cart from the UI