Add required app.py file for HF Spaces compatibility

Dockerfile

@@ -20,5 +20,5 @@ RUN chmod +x start.sh
 # Expose HF Space port
 EXPOSE 7860
 
-# Run the FastAPI application
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]
+# Run the FastAPI application (HF Spaces expects app.py at root)
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]

app.py

@@ -0,0 +1,5 @@
+# Import the FastAPI app from our app module
+from app.main import app
+
+# This file is required by Hugging Face Spaces
+# It simply imports and exposes our FastAPI app