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

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

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

@@ -1,4 +1,4 @@
-import socket
+import socket  # .material -> .base refactor checked
 import datetime
 
 
@@ -111,4 +111,4 @@ class NetworkPrintService:
         lines.append("\n\n\n")
 
         content = "\n".join(lines)
-        return self._send_to_printer(content)
+        return self._send_to_printer(content)