Add display monitor brightness and power control entities

- Add NUMBER platform for monitor brightness (0-100)
- Add SWITCH platform for monitor power on/off
- Add display API client methods (get_display_monitors, set_display_brightness, set_display_power)
- Add display API constants

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

custom_components/remote_media_player/number.py

@@ -0,0 +1,110 @@
+"""Number platform for Remote Media Player integration (display brightness)."""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from homeassistant.components.number import NumberEntity, NumberMode
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity import DeviceInfo
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from .api_client import MediaServerClient, MediaServerError
+from .const import DOMAIN
+
+_LOGGER = logging.getLogger(__name__)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up display brightness number entities from a config entry."""
+    client: MediaServerClient = hass.data[DOMAIN][entry.entry_id]["client"]
+
+    try:
+        monitors = await client.get_display_monitors()
+    except MediaServerError as err:
+        _LOGGER.error("Failed to fetch display monitors: %s", err)
+        return
+
+    entities = [
+        DisplayBrightnessNumber(
+            client=client,
+            entry=entry,
+            monitor=monitor,
+        )
+        for monitor in monitors
+        if monitor.get("brightness") is not None
+    ]
+
+    if entities:
+        async_add_entities(entities)
+        _LOGGER.info("Added %d display brightness entities", len(entities))
+
+
+class DisplayBrightnessNumber(NumberEntity):
+    """Number entity for controlling display brightness."""
+
+    _attr_has_entity_name = True
+    _attr_native_min_value = 0
+    _attr_native_max_value = 100
+    _attr_native_step = 1
+    _attr_native_unit_of_measurement = "%"
+    _attr_mode = NumberMode.SLIDER
+    _attr_icon = "mdi:brightness-6"
+
+    def __init__(
+        self,
+        client: MediaServerClient,
+        entry: ConfigEntry,
+        monitor: dict[str, Any],
+    ) -> None:
+        """Initialize the display brightness entity."""
+        self._client = client
+        self._entry = entry
+        self._monitor_id: int = monitor["id"]
+        self._monitor_name: str = monitor.get("name", f"Monitor {monitor['id']}")
+        self._resolution: str | None = monitor.get("resolution")
+        self._attr_native_value = monitor.get("brightness")
+
+        # Use resolution in name to disambiguate same-name monitors
+        display_name = self._monitor_name
+        if self._resolution:
+            display_name = f"{self._monitor_name} ({self._resolution})"
+
+        self._attr_unique_id = f"{entry.entry_id}_display_brightness_{self._monitor_id}"
+        self._attr_name = f"Display {display_name} Brightness"
+
+    @property
+    def device_info(self) -> DeviceInfo:
+        """Return device info."""
+        return DeviceInfo(
+            identifiers={(DOMAIN, self._entry.entry_id)},
+            name=self._entry.title,
+            manufacturer="Remote Media Player",
+            model="Media Server",
+        )
+
+    async def async_set_native_value(self, value: float) -> None:
+        """Set the brightness value."""
+        try:
+            await self._client.set_display_brightness(self._monitor_id, int(value))
+            self._attr_native_value = int(value)
+            self.async_write_ha_state()
+        except MediaServerError as err:
+            _LOGGER.error("Failed to set brightness for monitor %d: %s", self._monitor_id, err)
+
+    async def async_update(self) -> None:
+        """Fetch updated brightness from the server."""
+        try:
+            monitors = await self._client.get_display_monitors()
+            for monitor in monitors:
+                if monitor["id"] == self._monitor_id:
+                    self._attr_native_value = monitor.get("brightness")
+                    break
+        except MediaServerError as err:
+            _LOGGER.error("Failed to update brightness for monitor %d: %s", self._monitor_id, err)