重构(notify_dispatch): ALARM_TYPE_NAMES 改为直接从 constants 导入

app/services/notify_dispatch.py

@@ -21,7 +21,7 @@ from app.models import (
 )
 from app.config import settings
 from app.services.vlm_service import get_vlm_service
-from app.services.wechat_service import ALARM_TYPE_NAMES
+from app.constants import ALARM_TYPE_NAMES
 from app.services.camera_name_service import get_camera_name_service
 from app.services.work_order_client import get_work_order_client
 from app.utils.logger import logger