edit api_key access for OpenAI client

Author: marwan37

omni-reader/utils/model_info.py

@@ -45,7 +45,7 @@ class ModelConfig:
 
 def get_openai_client():
     """Get an OpenAI client with instructor integration."""
-    openai_client = OpenAI(api_key="ollama")
+    openai_client = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))
     return instructor.from_openai(openai_client)