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>

src/akkudoktoreos/prediction/feedintariffabc.py

@@ -21,14 +21,14 @@ class FeedInTariffDataRecord(PredictionRecord):
     """
 
     feed_in_tariff_wh: Optional[float] = Field(
-        None, json_schema_extra={"description": "Feed in tariff per Wh (€/Wh)"}
+        None, json_schema_extra={"description": "Feed in tariff per Wh [amount/Wh]"}
     )
 
     # Computed fields
     @computed_field  # type: ignore[prop-decorator]
     @property
     def feed_in_tariff_kwh(self) -> Optional[float]:
-        """Feed in tariff per kWh (€/kWh).
+        """Feed in tariff per kWh [amount/kWh].
 
         Convenience attribute calculated from `feed_in_tariff_wh`.
         """