fix: ensure EV charge rates settings available

Allow charge rates for electric vehicle to be provided by the POST
optimize endpoint. Create a default value in case neither the
parameters nor the configuration provide charge rates.

This is also to allow to migrate from 0.1.0 configuration format
to actual one.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

docs/_generated/config.md

@@ -602,7 +602,7 @@ Properties:
 | max_charge_power_w | `Optional[float]` | `rw` | `5000` | Maximum charging power [W]. |
 | min_charge_power_w | `Optional[float]` | `rw` | `50` | Minimum charging power [W]. |
 | charge_rates | `Optional[list[float]]` | `rw` | `None` | Charge rates as factor of maximum charging power [0.00 ... 1.00]. None denotes all charge rates are available. |
-| min_soc_percentage | `int` | `rw` | `0` | Minimum state of charge (SOC) as percentage of capacity [%]. |
+| min_soc_percentage | `int` | `rw` | `0` | Minimum state of charge (SOC) as percentage of capacity [%]. This is the target SoC for charging |
 | max_soc_percentage | `int` | `rw` | `100` | Maximum state of charge (SOC) as percentage of capacity [%]. |
 | measurement_key_soc_factor | `str` | `ro` | `N/A` | Measurement key for the battery state of charge (SoC) as factor of total capacity [0.0 ... 1.0]. |
 | measurement_key_power_l1_w | `str` | `ro` | `N/A` | Measurement key for the L1 power the battery is charged or discharged with [W]. |

docs/akkudoktoreos/optimpost.md

@@ -77,6 +77,7 @@ passed to the request. You have to set the parameters even if given in the confi
         "device_id": "ev1",
         "capacity_wh": 60000,
         "charging_efficiency": 0.95,
+        "charge_rates": [0.0, 0.375, 0.5, 0.625, 0.75, 0.875, 1.0],
         "discharging_efficiency": 1.0,
         "max_charge_power_w": 11040,
         "initial_soc_percentage": 54,