Updated app,py

app.py

@@ -15,6 +15,14 @@ from langchain_core.globals import set_llm_cache
 from langchain_core.caches import InMemoryCache
 import shutil
 
+from dotenv import load_dotenv
+
+# Load environment variables
+load_dotenv()
+
+# Set OpenAI API key
+os.environ["OPENAI_API_KEY"] = os.getenv("OPENAI_API_KEY")
+
 # Initialize caches and embeddings
 store = LocalFileStore("./cache/")
 set_llm_cache(InMemoryCache())