fix: Use importlib to avoid module name conflicts in HF Spaces

- Replace direct imports with importlib.util.spec_from_file_location
- Avoids conflicts between root app.py and backend/app module
- Resolves ModuleNotFoundError: No module named 'app.config'

app.py

@@ -22,9 +22,17 @@ from dotenv import load_dotenv
 load_dotenv(".env.local")
 load_dotenv(".env")
 
-# Now we can import from the backend
-from app.config.settings import settings
-from app.routers import grading
+# Now we can import from the backend - use specific module imports to avoid conflicts
+import importlib.util
+spec = importlib.util.spec_from_file_location("settings", backend_path / "app" / "config" / "settings.py")
+settings_module = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(settings_module)
+settings = settings_module.settings
+
+spec_grading = importlib.util.spec_from_file_location("grading", backend_path / "app" / "routers" / "grading.py")
+grading_module = importlib.util.module_from_spec(spec_grading)
+spec_grading.loader.exec_module(grading_module)
+grading = grading_module
 
 # Configure logging
 logging.basicConfig(