Fix OpenAIEmbeddings reference in exception handling

streamlit_app.py

@@ -111,15 +111,15 @@ def get_agent_model():
 @st.cache_resource
 def get_embedding_model():
     """Get the embedding model."""
+    from langchain_openai import OpenAIEmbeddings
+    import os
+    
     try:
         # First try the standard approach
         return OpenAIEmbeddings(model="text-embedding-3-small")
     except Exception as e:
         if "proxies" in str(e):
             # If there's a proxies error, create with additional kwargs to override defaults
-            import os
-            from langchain_openai import OpenAIEmbeddings
-            
             return OpenAIEmbeddings(
                 model="text-embedding-3-small",
                 openai_api_key=os.environ.get("OPENAI_API_KEY"),