fix(tools): import @tool in download_file.py and files_to_text.py

tools/download_file.py

@@ -1,4 +1,5 @@
 from typing import Optional
+from smolagents import tool
 
 @tool
 def download_file_from_url(url: str, filename: Optional[str] = None) -> str:

tools/files_to_text.py

@@ -1,3 +1,5 @@
+from smolagents import tool
+
 @tool
 def image_to_text(image_path: str) -> str:
     """