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/testdata/docs/_generated/configfeedintariff.md

@@ -95,7 +95,7 @@
 
 | Name | Type | Read-Only | Default | Description |
 | ---- | ---- | --------- | ------- | ----------- |
-| feed_in_tariff_kwh | `Optional[float]` | `rw` | `None` | Electricity price feed in tariff [€/kWH]. |
+| feed_in_tariff_kwh | `Optional[float]` | `rw` | `None` | Electricity price feed in tariff [amount/kWh]. |
 :::
 <!-- pyml enable line-length -->