Add automatic script reload support

Features:
- Listen for scripts_changed WebSocket messages
- Automatically reload integration when scripts change
- New on_scripts_changed callback in WebSocket client
- Seamless button entity updates without manual reload

Technical changes:
- Enhanced MediaServerWebSocket with scripts_changed handler
- Updated MediaPlayerCoordinator to trigger integration reload
- Pass config entry to coordinator for reload capability

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

custom_components/remote_media_player/api_client.py

@@ -307,6 +307,7 @@ class MediaServerWebSocket:
         token: str,
         on_status_update: Callable[[dict[str, Any]], None],
         on_disconnect: Callable[[], None] | None = None,
+        on_scripts_changed: Callable[[], None] | None = None,
     ) -> None:
         """Initialize the WebSocket client.
 
@@ -316,12 +317,14 @@ class MediaServerWebSocket:
             token: API authentication token
             on_status_update: Callback when status update received
             on_disconnect: Callback when connection lost
+            on_scripts_changed: Callback when scripts have changed
         """
         self._host = host
         self._port = int(port)
         self._token = token
         self._on_status_update = on_status_update
         self._on_disconnect = on_disconnect
+        self._on_scripts_changed = on_scripts_changed
         self._ws_url = f"ws://{host}:{self._port}/api/media/ws?token={token}"
         self._session: aiohttp.ClientSession | None = None
         self._ws: aiohttp.ClientWebSocketResponse | None = None
@@ -401,6 +404,10 @@ class MediaServerWebSocket:
                                 f"{status_data['album_art_url']}?token={self._token}&t={track_hash}"
                             )
                         self._on_status_update(status_data)
+                    elif msg_type == "scripts_changed":
+                        _LOGGER.info("Scripts changed notification received")
+                        if self._on_scripts_changed:
+                            self._on_scripts_changed()
                     elif msg_type == "pong":
                         _LOGGER.debug("Received pong")