fix logging

gitea/tools/pr_tools.py

@@ -1,10 +1,14 @@
 """Tools for Gitea pull request operations."""
 
 import json
+import logging
 from typing import Any
 from gitea.client import GiteaClient
 from gitea.models import PullRequestModel, CommentModel
 
+logger: logging.Logger = logging.getLogger("gitea.tools.pr_tools")
+
+
 _MAX_DIFF_CHARS: int = 15_000
 
 
@@ -93,7 +97,7 @@ class PRTools:
                     all_prs.extend([pr.model_dump() if hasattr(pr, 'model_dump') else pr for pr in prs])
             return all_prs
         except Exception as e:
-            print(f"DEBUG: list_assigned_pull_requests error: {e}")
+            logger.error(f"Error listing assigned pull requests: {e}", exc_info=True)
             return []
 
     def list_pull_requests(self, owner: str, repo: str, state: str = "open") -> str: