fix(fc2a): move pytestmark below imports in test_importer.py (E402)

Misplaced the integration marker between import groups in the previous
commit — I only read the top 12 lines so I missed the 3 more imports
below. ruff flagged it correctly as E402.

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

tests/test_importer.py

@@ -11,12 +11,12 @@ import pytest
 from PIL import Image
 from sqlalchemy import select
 
-pytestmark = pytest.mark.integration
-
 from backend.app.models import Artist, ImageRecord, ImportSettings, Tag, TagKind
 from backend.app.services.importer import Importer, SkipReason
 from backend.app.services.thumbnailer import Thumbnailer
 
+pytestmark = pytest.mark.integration
+
 
 @pytest.fixture
 def import_layout(tmp_path):