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/devices/devices.py

@@ -51,7 +51,7 @@ class BatteriesCommonSettings(DevicesBaseSettings):
     levelized_cost_of_storage_kwh: float = Field(
         default=0.0,
         json_schema_extra={
-            "description": "Levelized cost of storage (LCOS), the average lifetime cost of delivering one kWh [€/kWh].",
+            "description": "Levelized cost of storage (LCOS), the average lifetime cost of delivering one kWh [amount/kWh].",
             "examples": [0.12],
         },
     )