Enhance BaseDevice initialization and error handling

- Updated the `BaseDevice` class constructor to accept an optional `name` parameter for better context in error messages.
- Improved the `_validate_contract` method to raise an `OxiAPIError` with a descriptive message if the node is not found.
- Modified the `_run_ttp` method to include a check for node existence, returning `None` if not found.
- Changed the test file name in the `Eltex` model to reflect a more descriptive context for testing node not found scenarios.

oxi/conf.py

@@ -60,7 +60,7 @@ class NodeConfig:
         self._device: type[BaseDevice] = device_registry.get(self._model.lower())
         if self._device is None:
             raise ValueError(f"Device model '{self._model}' not found in registry")
-        self._parsed_data = self._device(self.text).parse()
+        self._parsed_data = self._device(self.text, name=self._full_name).parse()
 
     @cached_property
     def _response(self):