Add CaptchaAI support to Unicaps

[Ethan-wkr]

Hi @sergey-scat ,

Thanks for building unicaps — it’s a fantastic unified interface for multiple CAPTCHA-solving APIs.

I’d like to suggest adding CaptchaAI as another supported backend. CaptchaAI provides a lightweight HTTP API that handles image CAPTCHAs and reCAPTCHA v2/v3.

Including it would give users one more choice and enrich the functionality of the library.

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

Thanks again for this great project — happy to help if you'd like to discuss integration details!