Fix mypy typecheck failures in sqlmodels view generators

[Copilot]

The GitHub Actions typecheck job was failing due to five strict type-checking errors across three files in the sqlmodels views modules. This PR resolves those failures to restore a green CI build.

Changes

Metaclass Attribute Resolution

Mypy fails to resolve the __tablename__ property on SQLModelMetaclass when iterating over raw class types to drop database tables. Inline type ignores are applied to silence these false positives:

• Added # type: ignore[attr-defined] inside:
  • src/fundamend/sqlmodels/migview.py
  • src/fundamend/sqlmodels/ahbview.py

# Before
session.execute(sqlalchemy.text(f"DROP TABLE IF EXISTS {model_class.__tablename__};"))

# After
session.execute(sqlalchemy.text(f"DROP TABLE IF EXISTS {model_class.__tablename__};"))  # type: ignore[attr-defined]

Proper Enum Type Initialization

AhbExpression constructor requires format to be an instance of the EdifactFormat enum, but was being initialized with a raw str:

• Wrapped row[1] in the EdifactFormat constructor inside src/fundamend/sqlmodels/expression_view.py:

# Before
AhbExpression(
    edifact_format_version=row[0],
    format=row[1],
    ...
)

# After
AhbExpression(
    edifact_format_version=row[0],
    format=EdifactFormat(row[1]),
    ...
)