feat: Implement currency management with models, routes, and UI updates; add backfill script for existing records

tests/unit/test_production.py

@@ -21,7 +21,7 @@ def _create_scenario(client: TestClient) -> int:
 
 def test_create_production_record(client: TestClient) -> None:
     scenario_id = _create_scenario(client)
-    payload = {
+    payload: dict[str, any] = {
         "scenario_id": scenario_id,
         "amount": 475.25,
         "description": "Daily output",