change module in dockerfile

Dockerfile

@@ -11,4 +11,4 @@ RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
 COPY . .
 
 # Start the FastAPI app on port 7860, the default port expected by Spaces
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]