fix logging

gitea/tools/issue_tools.py

@@ -1,10 +1,14 @@
 """Tools for Gitea issue operations."""
 
 import json
+import logging
 from typing import Any
 from gitea.client import GiteaClient
 from gitea.models import IssueModel, CommentModel, LabelModel
 
+logger: logging.Logger = logging.getLogger("gitea.tools.issue_tools")
+
+
 
 class IssueTools:
     """Tools for Gitea issue operations."""
@@ -69,7 +73,7 @@ class IssueTools:
                     all_issues.extend([issue.model_dump() if hasattr(issue, 'model_dump') else issue for issue in issues])
             return all_issues
         except Exception as e:
-            print(f"DEBUG: list_assigned_issues error: {e}")
+            logger.error(f"Error listing assigned issues: {e}", exc_info=True)
             return []
 
     def list_issues(self, owner: str, repo: str, state: str = "open") -> str: