fix: resolve CI linting and type checking errors

scaffoldforge/templates/python/default/models.py.j2

@@ -3,12 +3,14 @@
 Generated from GitHub Issue #{{ issue_number }}
 """
 
-
-class DataModel:
-    """TODO: Implement data model class."""
-    pass
+from dataclasses import dataclass
 
 
-class AnotherModel:
-    """TODO: Implement another model class."""
-    pass
+@dataclass
+class Item:
+    """TODO: Define item model."""
+    name: str
+    description: str = ""
+
+
+# TODO: Add more models based on requirements