refactor: Modifikator-Helfer öffentlich, load_scenario_inputs aus run_projection (A13-T1)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

finance/app/engine/scenario.py

@@ -37,8 +37,8 @@ class PlainModifier:
     end_date: date | None = None
 
 
-def _modified(amount: Decimal, category_id: int | None, recurring_id: int | None,
-              modifiers: list[PlainModifier]) -> Decimal | None:
+def modified_amount(amount: Decimal, category_id: int | None, recurring_id: int | None,
+                    modifiers: list[PlainModifier]) -> Decimal | None:
     for m in modifiers:
         hit = ((m.target_type == "category" and category_id == m.target_id)
                or (m.target_type == "recurring" and recurring_id == m.target_id))
@@ -56,7 +56,7 @@ def _modified(amount: Decimal, category_id: int | None, recurring_id: int | None
     return amount
 
 
-def _effective_end(r: PlainRecurring, modifiers: list[PlainModifier]) -> date | None:
+def effective_end(r: PlainRecurring, modifiers: list[PlainModifier]) -> date | None:
     """Fruehestes Ende aus eigenem end_date und allen treffenden ende-Modifikatoren."""
     end = r.end_date
     for m in modifiers:
@@ -76,14 +76,14 @@ def build_cashflows(recurring: list[PlainRecurring], planned: list[PlainPlanned]
                     window_start: date, window_end: date) -> list[tuple[date, Decimal]]:
     flows: list[tuple[date, Decimal]] = []
     for r in recurring:
-        amount = _modified(r.amount, r.category_id, r.id, modifiers)
+        amount = modified_amount(r.amount, r.category_id, r.id, modifiers)
         if amount is None:
             continue
         for d in occurrences(r.rhythm, r.due_day, window_start, window_end,
-                             r.start_date, _effective_end(r, modifiers)):
+                             r.start_date, effective_end(r, modifiers)):
             flows.append((d, amount))
     for p in planned:
-        amount = _modified(p.amount, p.category_id, None, modifiers)
+        amount = modified_amount(p.amount, p.category_id, None, modifiers)
         if amount is not None and window_start <= p.due <= window_end:
             flows.append((p.due, amount))
     for d, payout in loan_payouts: