Initial commit: HACS-ready Home Assistant integration

Remote Media Player integration for controlling PC media playback
from Home Assistant via the Media Server API.

Features:
- Full media player controls (play, pause, stop, next, previous)
- Volume control and mute
- Seek support with smooth timeline updates
- Real-time updates via WebSocket
- Script buttons for PC control (shutdown, restart, lock, etc.)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

custom_components/remote_media_player/const.py

@@ -0,0 +1,40 @@
+"""Constants for the Remote Media Player integration."""
+
+DOMAIN = "remote_media_player"
+
+# Configuration keys
+CONF_HOST = "host"
+CONF_PORT = "port"
+CONF_TOKEN = "token"
+CONF_POLL_INTERVAL = "poll_interval"
+CONF_NAME = "name"
+CONF_USE_WEBSOCKET = "use_websocket"
+
+# Default values
+DEFAULT_PORT = 8765
+DEFAULT_POLL_INTERVAL = 5
+DEFAULT_NAME = "Remote Media Player"
+DEFAULT_USE_WEBSOCKET = True
+DEFAULT_RECONNECT_INTERVAL = 30
+
+# API endpoints
+API_HEALTH = "/api/health"
+API_STATUS = "/api/media/status"
+API_PLAY = "/api/media/play"
+API_PAUSE = "/api/media/pause"
+API_STOP = "/api/media/stop"
+API_NEXT = "/api/media/next"
+API_PREVIOUS = "/api/media/previous"
+API_VOLUME = "/api/media/volume"
+API_MUTE = "/api/media/mute"
+API_SEEK = "/api/media/seek"
+API_SCRIPTS_LIST = "/api/scripts/list"
+API_SCRIPTS_EXECUTE = "/api/scripts/execute"
+API_WEBSOCKET = "/api/media/ws"
+
+# Service names
+SERVICE_EXECUTE_SCRIPT = "execute_script"
+
+# Service attributes
+ATTR_SCRIPT_NAME = "script_name"
+ATTR_SCRIPT_ARGS = "args"