added openai model back

app/routes/chat_api.py

@@ -8,7 +8,7 @@ from typing import List, Dict, Any
 from google.genai import types
 from google import genai
 import openai
-from app.credentials_manager import _refresh_auth
+from ..credentials_manager import _refresh_auth
 
 # Local module imports
 from models import OpenAIRequest, OpenAIMessage