refactor: code cleanup

tests/test_providers.py

@@ -6,9 +6,9 @@ from unittest.mock import Mock, patch
 import pytest
 
 from providers import ModelProviderRegistry, ModelResponse
-from providers.base import ProviderType
 from providers.gemini import GeminiModelProvider
 from providers.openai_provider import OpenAIModelProvider
+from providers.shared import ProviderType
 
 
 class TestModelProviderRegistry: