feat: rename genetic optimization API fields to English (#675)

Rename the German field names of the genetic optimization API to
English with full backward compatibility:

- English names are canonical and documented in the OpenAPI schema;
  the German names are still accepted on input via validation aliases
  and re-emitted in responses as deprecated computed fields
- fix visualization receiving the raw German-keyed simulation dict
  (KeyError: load_wh_per_hour)
- rename internal German identifiers (optimize_ems, total_balance,
  battery_residual_value, self_consumption, extra_data keys)
- use amount instead of currency/euro in chart labels and schema
  descriptions; document currency handling (whole currency units,
  never cents) in the API description
- regenerate openapi.json and generated docs

Co-authored-by: Tobias Welz <tobias.wizneteu@gmail.com>

tests/test_inverter_efficiency.py

@@ -582,7 +582,7 @@ def _run_evaluate_with_mocked_sim(
         fitness = optim.evaluate(
             fake_individual,
             parameters=Mock(
-                ems=Mock(preis_euro_pro_wh_akku=0.0),
+                ems=Mock(price_per_wh_battery=0.0),
                 eauto=None,
             ),
             start_hour=start_hour,