Update app.py

app.py

@@ -5,7 +5,7 @@ from dotenv import load_dotenv
 
 # Load API key from .env file
 load_dotenv()
-api_key = os.getenv("OPENAI_API_KEY")
+api_key = os.getenv("openai")
 
 if not api_key:
     raise ValueError("API Key not found! Ensure you have added OPENAI_API_KEY in your .env file.")