Add as_dict for CashFlowAnalysis

    def balance(self) -> Decimal:

        return self.total_income - self.total_expenses

    @property

    def as_dict(self) -> dict[str, str]:

        return {

            "balance": self.balance,

            "totalIncome": self.total_income,

            "totalExpenses": self.total_expenses,

        }

    @classmethod

    def from_files(cls, payment_orders_path: Path, budget_plan_path: Path) -> Self:

        budget_plan = load_pdf(budget_plan_path)