Skip API key for HuggingFace models in litellm

- When using HuggingFace inference endpoints, set api_key to None to avoid auth errors

codai/openai/litellm.py

@@ -404,6 +404,12 @@ class LiteLLMBackend:
         # Store tool_parser for post-processing
         self.tool_parser = tool_parser
         
+        # For HuggingFace models, set API key to None to skip auth
+        # This allows using HF inference endpoints without authentication
+        if use_model and 'huggingface' in use_model.lower():
+            litellm.api_key = None
+            print("DEBUG litellm: HuggingFace model - skipping API key")
+        
         # Convert tools to coderai schema format if tools provided
         if tools:
             self.tools_schema = {}