919a4673e6
- Add CookieValidationResult Pydantic model with valid, username, user_id, reason fields - Add validate_cookie async method to ZhihuLogin class - Validate cookie via Zhihu /api/v4/me endpoint - Handle 200, 401, and other status codes appropriately - Handle network errors gracefully Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>