Fix CI issues: add Config class, fix config access patterns, remove unused imports

shellgenius/ollama_client.py

@@ -21,8 +21,8 @@ class OllamaClient:
             model: Model name to use
         """
         config = get_config()
-        self.host = host or config.ollama_host
-        self.model = model or config.ollama_model
+        self.host = host or config.get("ollama_host", "localhost:11434")
+        self.model = model or config.get("ollama_model", "llama3")
         self._client: Optional[ollama.Client] = None
 
     @property