Add HuggingFace token environment variable loading

- Add comment to clarify HuggingFace token environment variable
- Ensure secure and explicit token retrieval from environment
- Maintain consistent approach to sensitive configuration management

app.py

@@ -10,6 +10,7 @@ import os
 from dotenv import load_dotenv
 load_dotenv()
 
+# HuggingFace token
 HUGGINGFACE_TOKEN = os.environ.get("HUGGINGFACE_TOKEN", os.getenv("HUGGINGFACE_TOKEN"))
 
 # Initialize the HuggingFace model