refactor: unify standalone mode check using environment variable

py/utils/usage_stats.py

@@ -1,6 +1,5 @@
 import os
 import json
-import sys
 import time
 import asyncio
 import logging
@@ -12,7 +11,7 @@ from ..config import config
 from ..services.service_registry import ServiceRegistry
 
 # Check if running in standalone mode
-standalone_mode = 'nodes' not in sys.modules
+standalone_mode = os.environ.get("HF_HUB_DISABLE_TELEMETRY", "0") == "0"
 
 if not standalone_mode:
     from ..metadata_collector.metadata_registry import MetadataRegistry