fix(devices): preserve charge-rate typing and public import compatibility

src/akkudoktoreos/devices/devices.py

@@ -11,7 +11,10 @@ from akkudoktoreos.core.cache import CacheFileStore
 from akkudoktoreos.core.coreabc import ConfigMixin, SingletonMixin
 from akkudoktoreos.core.emplan import ResourceStatus
 from akkudoktoreos.core.pydantic import ConfigDict, PydanticBaseModel
-from akkudoktoreos.devices.settings.batterysettings import BatteriesCommonSettings
+from akkudoktoreos.devices.settings.batterysettings import (
+    BATTERY_DEFAULT_CHARGE_RATES as BATTERY_DEFAULT_CHARGE_RATES,
+    BatteriesCommonSettings,
+)
 from akkudoktoreos.devices.settings.homeappliancesettings import (
     HomeApplianceCommonSettings,
 )

src/akkudoktoreos/devices/settings/batterysettings.py

@@ -190,7 +190,7 @@ class BatteriesCommonSettings(DevicesBaseSettings):
     def validate_and_sort_charge_rates(cls, v: Any) -> NDArray[Shape["*"], float]:
         # None means fallback to default values
         if v is None:
-            return BATTERY_DEFAULT_CHARGE_RATES.copy()
+            return np.asarray(BATTERY_DEFAULT_CHARGE_RATES, dtype=float).copy()
 
         # Convert to numpy array
         if isinstance(v, str):