Fix issue with frontend folder

backend/app.py

@@ -21,7 +21,7 @@ app.add_middleware(
 # Mount static files (frontend) so that visiting "/" serves index.html
 # Note: The directory path "../frontend" works because when running in Docker,
 # our working directory is set to /app, and the frontend folder is at /app/frontend.
-app.mount("/", StaticFiles(directory="../frontend", html=True), name="static")
+app.mount("/", StaticFiles(directory="./frontend", html=True), name="static")
 
 # Load tokenizer and GPT2 model
 tokenizer = GPT2Tokenizer.from_pretrained('gpt2')