[v0.3.72] Enhance content extraction and proxy support

- Add ContentCleaningStrategy for improved content extraction
- Implement advanced proxy configuration with authentication
- Enhance image source detection and handling
- Add fit_markdown and fit_html for refined content output
- Improve external link and image handling flexibility

crawl4ai/models.py

@@ -14,6 +14,8 @@ class CrawlResult(BaseModel):
     links: Dict[str, List[Dict]] = {}
     screenshot: Optional[str] = None
     markdown: Optional[str] = None
+    fit_markdown: Optional[str] = None
+    fit_html: Optional[str] = None
     extracted_content: Optional[str] = None
     metadata: Optional[dict] = None
     error_message: Optional[str] = None