Chore: enable flake8-logging-format G101/G202 ruff rules

G202 (redundant exc_info=True passed to logger.exception, which
already includes the traceback) had 2 hits in documents/views.py,
fixed manually since ruff has no autofix for it. G101 (hardcoded
password string) had zero hits.

src/documents/views.py

@@ -1570,7 +1570,6 @@ class DocumentViewSet(
                     "document %s: %s",
                     doc.pk,
                     exc,
-                    exc_info=True,
                 )
                 raise ValidationError(
                     {"ai": [_("Invalid AI configuration.")]},
@@ -1581,7 +1580,6 @@ class DocumentViewSet(
                     "document %s: %s",
                     doc.pk,
                     exc,
-                    exc_info=True,
                 )
                 return Response(
                     {"ai": [_("AI backend request timed out.")]},