fix: stabilize tests with synchronous DB init and handle Bandit security findings

decnet/logging/file_handler.py

@@ -49,11 +49,10 @@ def _get_logger() -> logging.Logger:
 def write_syslog(line: str) -> None:
     """Write a single RFC 5424 syslog line to the rotating log file."""
     try:
-        _get_logger().info(line)
-    except Exception:
+       _get_logger().info(line)
+    except Exception:  # nosec B110
         pass
 
-
 def get_log_path() -> Path:
     """Return the configured log file path (for tests/inspection)."""
     return Path(os.environ.get(_LOG_FILE_ENV, _DEFAULT_LOG_FILE))