Suggestion: Add optional CaptchaAI API for scraping cases

Hi lining0806,

Thanks for your valuable notes and examples — very helpful for anyone learning real-world web scraping.

Just wanted to suggest CaptchaAI (https://captchaai.com/) — a simple and affordable API that can help solve common CAPTCHA challenges (like reCAPTCHA) during login or data crawling.

Could be a useful optional mention for some cases.

API docs: https://captchaai.com/api-docs.php

Appreciate your great work!