v10.2.0

Add standalone HA API auto-discovery without MQTT

Summary

• Added standalone HA API device discovery so devices can be registered in Home Assistant
  without an MQTT broker — the integration listens for hass_agent_device_update events on
  the global event bus and auto-starts a config flow for unknown serial numbers
• Added async_step_ha_api config flow step and a user menu with HA API info and Local API options
• Fixed event.py missing the WebSocket dispatcher listener for notification actions
  (hass_agent_notification_action_{entry_id})
• Updated all entity platforms (sensor, media_player, button, notify, event) to
  skip MQTT publish/subscribe for HA API-only entries using the ha_api_only flag