fix: Resolve Ruff E402 warnings and clean up imports across multiple modules

services/pricing.py

@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 """Pricing service implementing commodity revenue calculations.
 
 This module exposes data models and helpers for computing product pricing
@@ -9,6 +7,8 @@ calculation steps (payable metal, penalties, net revenue) and is intended to be
 composed within broader scenario evaluation workflows.
 """
 
+from __future__ import annotations
+
 from dataclasses import dataclass, field
 from typing import Mapping