feat: ensure model aliases unique

Author: richdougherty

llama_cpp/server/model.py

@@ -19,6 +19,12 @@ def __init__(self, models: List[ModelSettings]) -> None:
         for model in models:
             if not model.model_alias:
                 model.model_alias = model.model
+            if model.model_alias in self._model_settings_dict:
+                raise ValueError(
+                    f"Please specify a unique model alias for each model: {model.model_alias}"
+                )
+            if model.verbose:
+                print(f"Registering model: {model.model_alias}")
             self._model_settings_dict[model.model_alias] = model
 
         self._current_model: Optional[llama_cpp.Llama] = None