feat: Strom, Leistung und Strombudget

Zeigt strip.current_ma und strip.power_w aus system/info als Sensoren
und macht max_milliamps aus system/settings ueber ein Zahlenfeld
einstellbar. Schreiben liest wie bei sACN zurueck statt den
geschriebenen Wert anzunehmen.

custom_components/ninstrip/number.py

@@ -10,7 +10,7 @@ from homeassistant.components.number import (
     NumberEntityDescription,
     NumberMode,
 )
-from homeassistant.const import EntityCategory, UnitOfTime
+from homeassistant.const import EntityCategory, UnitOfElectricCurrent, UnitOfTime
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
@@ -60,6 +60,7 @@ async def async_setup_entry(
     entitaeten: list[NumberEntity] = [NinstripZeit(coordinator, d) for d in ZEITEN]
     entitaeten.append(NinstripSacnUniverse(coordinator))
     entitaeten.append(NinstripSacnStartSlot(coordinator))
+    entitaeten.append(NinstripStrombudget(coordinator))
     async_add_entities(entitaeten)
 
 
@@ -141,3 +142,28 @@ class NinstripSacnStartSlot(NinstripSacnEntity, NumberEntity):
 
     async def async_set_native_value(self, value: float) -> None:
         await self.coordinator.async_set_sacn(start_slot=int(value))
+
+
+class NinstripStrombudget(NinstripEntity, NumberEntity):
+    """Was das Netzteil hergibt. Die Firmware regelt daran."""
+
+    _attr_entity_category = EntityCategory.CONFIG
+    _attr_translation_key = "max_milliamps"
+    _attr_native_min_value = 100
+    # Die Firmware nimmt fuer das Budget hoechstens 65535 mA an (uint16).
+    _attr_native_max_value = 65535
+    _attr_native_step = 100
+    _attr_mode = NumberMode.BOX
+    _attr_native_unit_of_measurement = UnitOfElectricCurrent.MILLIAMPERE
+
+    def __init__(self, coordinator: NinstripCoordinator) -> None:
+        super().__init__(coordinator, "max_milliamps")
+
+    @property
+    def native_value(self) -> float | None:
+        strip = self.coordinator.data.settings.get("strip")
+        wert = strip.get("max_milliamps") if isinstance(strip, dict) else None
+        return float(wert) if isinstance(wert, (int, float)) else None
+
+    async def async_set_native_value(self, value: float) -> None:
+        await self.coordinator.async_set_strip(max_milliamps=int(value))