Implement ALTCHA captcha service with challenge generation and solution verification
- Added AltchaService class for managing ALTCHA captcha challenges and solutions. - Created CaptchaController to handle API requests for generating challenges. - Introduced CaptchaGuard for validating captcha solutions on public endpoints. - Developed unit tests for AltchaService to ensure challenge creation and solution verification functionality. - Implemented integration tests for the Captcha API endpoint and captcha bypass behavior when disabled. - Added documentation for the Captcha API in the corresponding markdown file.
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