Use ModelCapabilities consistently instead of dictionaries

Moved aliases as part of SUPPORTED_MODELS instead of shorthand, more in line with how custom_models are declared
Further refactoring to cleanup some code

tests/test_auto_mode.py

@@ -59,7 +59,7 @@ class TestAutoMode:
                         continue
 
                     # Check that model has description
-                    description = config.get("description", "")
+                    description = config.description if hasattr(config, "description") else ""
                     if description:
                         models_with_descriptions[model_name] = description