- Add ZhihuCrawler class with crawl_answer() and crawl_article() methods
- Implement ZhihuApiInterceptor for capturing /api/v4/ responses
- Add _parse_author(), _parse_metadata(), _parse_answer_data(), _parse_article_data() helpers
- Support DOM parsing fallback for zhuanlan articles
- Export ZhihuCrawler and ZhihuApiInterceptor from __init__.py
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>