Refactor REST methods and UI components

- Introduced ServicesUsageItem class to encapsulate service usage details.
- Updated ServicesUsage to utilize ServicesUsageItem for type safety.
- Enhanced Transports and TunnelServers classes with improved GUI handling using StockField.
- Added StockField and related fields for consistent UI element definitions.
- Refactored get_gui methods to return structured GUI elements.
- Improved type hints across various methods for better clarity and type safety.
- Added utility functions for creating common UI fields.
- Updated documentation and comments for clarity and maintainability.

server/src/uds/REST/methods/services_pool_groups.py

@@ -96,7 +96,7 @@ class ServicesPoolGroups(ModelHandler[ServicePoolGroupItem]):
 
     # Gui related
     def get_gui(self, type_: str) -> list[typing.Any]:
-        local_gui = self.default_fields([], ['name', 'comments', 'priority'])
+        local_gui = self.compose_gui([], ['name', 'comments', 'priority'])
 
         for field in [
             {