docs: Playwright/Puppeteer/Selenium compatibility

[iWedmak]

Добавлен раздел о совместимости с Playwright, Puppeteer и Selenium — Ceki использует raw CDP, те же методы и параметры.

[iWedmak]

Fix #3: Add Known Differences section + Fix #4: Russian → English

1. Translate Russian lines in Per-framework migration

- - **undetected-chromedriver** — больше не нужен. Ceki предоставляет реальный fingerprint браузера реального человека + резидентный IP. Никаких патчей WebDriver.
- - **selenium-wire** — перехват запросов: `browser.send({"method": "Network.enable"})` + подписка на событие `Network.responseReceived`.
+ - **undetected-chromedriver** — no longer needed. Ceki provides a real human browser fingerprint + residential IP. No WebDriver patches required.
+ - **selenium-wire** — request interception: `browser.send({"method": "Network.enable"})` + subscribe to `Network.responseReceived` events.

2. Add Known Differences section

Insert after the browser.send() explanation paragraph, before ## Environment Variables:

### Known Differences

Ceki's CDP-over-WSS relay is not a direct local CDP pipe — a few differences to keep in mind when migrating from Playwright / Puppeteer / Selenium:

- **No CSS selectors on interaction methods** — `click`, `type`, and `scroll` take viewport coordinates, not CSS selectors. For element-based selection, use `Runtime.evaluate` to get bounding rects, then pass coordinates.
- **Speed** — each command travels over the WebSocket relay with ~50–200ms round-trip (internet-latency dependent, unlike local CDP which is sub-millisecond). Batch operations in a single `Runtime.evaluate` where possible, rather than chaining many small CDP calls.
- **120s grace window** — after each command there's a 120s window before the session auto-closes. This is by design for workflow chaining, but long-running idle sessions will need a keepalive.
- **Runtime.evaluate serialization** — CDP's `Runtime.evaluate` returns JSON-serializable values only. Functions, symbols, DOM nodes, and circular references are not transferable. Use `--returnByValue` explicitly.