test(quality_dashboard): scaffold + shape tests (Task 1)

Tests for empty-DB all-clear, canonical section order, and required
keys on each section. All fail until Task 2 lands the snapshot helper.

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

fusion_plating/fusion_plating_quality/tests/__init__.py

@@ -1,2 +1,3 @@
 # -*- coding: utf-8 -*-
 from . import test_part_catalog_contract_review_enforcement
+from . import test_dashboard_snapshot