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>

docs/_generated/openapi.md

@@ -1,9 +1,22 @@
 # Akkudoktor-EOS
 
-**Version**: `v0.3.0.dev2607171544999797`
+**Version**: `v0.3.0.dev2607171715033828`
 
 <!-- pyml disable line-length -->
 **Description**: This project provides a comprehensive solution for simulating and optimizing an energy system based on renewable energy sources. With a focus on photovoltaic (PV) systems, battery storage (batteries), load management (consumer requirements), heat pumps, electric vehicles, and consideration of electricity price data, this system enables forecasting and optimization of energy flow and costs over a specified period.
+
+## Currency Information
+
+All monetary values in this API are expressed in the locally configured currency of the EOS installation. The system is designed to work with any currency (e.g., EUR, SEK, CHF, USD, GBP, etc.). Each installation uses a single, consistent currency throughout all endpoints and responses.
+
+Values are given in whole currency units, not in hundredth subunits: a value of `0.0003` in an installation configured for Euro means 0.0003 EUR/Wh (i.e. 0.30 EUR/kWh), never cents. The same applies to all totals (e.g. `total_costs` of `1.5` = 1.50 EUR).
+
+Field names containing cost, price, revenue, tariff, or similar monetary terms (e.g., `total_costs`, `electricity_price_per_wh`, `revenue_per_hour`) represent amounts in the configured currency, without explicit currency designation in the field name to maintain currency-neutrality.
+
+## Deprecated Field Names
+
+The genetic optimization API fields were renamed from German to English. For backward compatibility the old German field names (e.g. `gesamtlast`, `pv_prognose_wh`, `Gesamtbilanz_Euro`) are still accepted on input and are emitted in responses alongside the English names, marked as deprecated in the schema. They will be removed in a future release — new clients should use the English field names only.
+
 <!-- pyml enable line-length -->
 
 **Base URL**: `No base URL provided.`
@@ -184,7 +197,7 @@ Fastapi Strompreis
 <!-- pyml disable line-length -->
 ```python
 """
-Deprecated: Electricity Market Price Prediction per Wh (€/Wh).
+Deprecated: Electricity Market Price Prediction per Wh [amount/Wh].
 
 Electricity prices start at 00.00.00 today and are provided for 48 hours.
 If no prices are available the missing ones at the start of the series are