refactor(proxy): consolidate proxy configuration handling

Moves ProxyConfig from configs/ directory into proxy_strategy.py to improve code organization and reduce fragmentation. Updates all imports and type hints to reflect the new location.

Key changes:
- Moved ProxyConfig class from configs/proxy_config.py to proxy_strategy.py
- Updated type hints in async_configs.py to support ProxyConfig
- Fixed proxy configuration handling in browser_manager.py
- Updated documentation and examples to use new import path

BREAKING CHANGE: ProxyConfig import path has changed from crawl4ai.configs to crawl4ai.proxy_strategy

crawl4ai/content_scraping_strategy.py

@@ -742,7 +742,7 @@ class WebScrapingStrategy(ContentScrapingStrategy):
                 for element in body.select(excluded_selector):
                     element.extract()
 
-        if css_selector:
+        if False and css_selector:
             selected_elements = body.select(css_selector)
             if not selected_elements:
                 return {
@@ -848,6 +848,7 @@ class WebScrapingStrategy(ContentScrapingStrategy):
 
         return {
             # **markdown_content,
+            "scraped_html": html,
             "cleaned_html": cleaned_html,
             "success": success,
             "media": media,