Fix Hassfest validation by adding CONFIG_SCHEMA

Add empty config schema to satisfy Hassfest requirement. Integration has no configuration parameters but requires the schema definition.

custom_components/spotify_search/__init__.py

@@ -1,7 +1,9 @@
 """Spotify Search Integration for Home Assistant."""
 import logging
 import re
+import voluptuous as vol
 from homeassistant.core import HomeAssistant, ServiceCall
+import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.typing import ConfigType
 
 _LOGGER = logging.getLogger(__name__)
@@ -9,6 +11,8 @@ _LOGGER = logging.getLogger(__name__)
 DOMAIN = "spotify_search"
 VALID_SEARCH_TYPES = {"artist", "album", "track", "playlist"}
 
+CONFIG_SCHEMA = cv.empty_config_schema(DOMAIN)
+
 # Cache Spotify client to avoid repeated lookups
 _spotify_cache = {
     "client": None,