fix(fc2b): ruff import sort in test_ml_tagger.py

ruff isort orders Tagger before TagPrediction (its case-insensitive
tiebreak). One-char autofix; ruff check now clean across backend/tests/alembic.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_ml_tagger.py

@@ -10,8 +10,8 @@ import pytest
 from backend.app.services.ml.tagger import (
     STORE_FLOOR,
     SURFACED_CATEGORIES,
-    TagPrediction,
     Tagger,
+    TagPrediction,
     get_tagger,
 )