feat: initial release — LedGrab Home Assistant integration

HACS-compatible custom component split out from the main LedGrab repo.
Creates light, switch, sensor, number, and select entities for each
configured LedGrab device.

custom_components/ledgrab/const.py

@@ -0,0 +1,22 @@
+"""Constants for the LedGrab Home Assistant integration."""
+
+DOMAIN = "ledgrab"
+
+# Configuration
+CONF_SERVER_NAME = "server_name"
+CONF_SERVER_URL = "server_url"
+CONF_API_KEY = "api_key"
+
+# Default values
+DEFAULT_SCAN_INTERVAL = 3  # seconds
+DEFAULT_TIMEOUT = 10  # seconds
+WS_RECONNECT_DELAY = 5  # seconds
+WS_MAX_RECONNECT_DELAY = 60  # seconds
+
+# Target types
+TARGET_TYPE_LED = "led"
+TARGET_TYPE_HA_LIGHT = "ha_light"
+
+# Data keys stored in hass.data[DOMAIN][entry_id]
+DATA_COORDINATOR = "coordinator"
+DATA_EVENT_LISTENER = "event_listener"