clean up unused function

Signed-off-by: Lu Ken <bluewish.ken.lu@live.cn>

Author: kenplusplus

src/gentrade/news/meta.py

@@ -61,27 +61,6 @@ def to_dict(self) -> Dict[str, Any]:
             "market": self.market,
         }
 
-    def fetch_article_html(self) -> Optional[str]:
-        """Fetch raw HTML content from the article's direct URL.
-
-        Uses a browser-like user agent to avoid being blocked by servers.
-
-        Returns:
-            Raw HTML string if successful; None if request fails.
-        """
-        headers = {
-            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
-                          "(KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
-        }
-
-        try:
-            response = requests.get(self.url, headers=headers, timeout=15)
-            response.raise_for_status()
-            return response.text
-        except requests.RequestException as e:
-            logger.debug(f"Failed to fetch HTML for {self.url}: {e}")
-            return None
-
 class NewsProviderBase(metaclass=abc.ABCMeta):
     """Abstract base class defining the interface for news providers.