chore: add .material->.base refactor check comments

Co-authored-by: aider (openai/DeepSeek-V3.2-Thinking) <aider@aider.chat>

inventory-backend/app/services/print/label_service.py

@@ -1,4 +1,4 @@
-import socket
+import socket  # .material -> .base refactor checked
 import base64
 import os
 from io import BytesIO
@@ -315,4 +315,4 @@ class LabelPrintService:
 
 
 if __name__ == "__main__":
-    pass
+    pass