Merge remote-tracking branch 'origin/feat/332-image-categories-pr1' into feat/331-collections-pr1

Keep both features: a duplicate removal moves collection memberships and
copies the image category; both migrations and schema checks run; the
legacy route snapshot now records the six collection routes beside the
image category routes.

database/operations.py

@@ -28,6 +28,7 @@ from .health import HealthOperations, iter_consistency_issues
 from .duplicate_copies import DuplicateCopyOperations
 from .workflow_storage import WorkflowStorageOperations
 from .category_import import CategoryImportOperations, EmptyReplacement  # noqa: F401
+from .image_categories import ImageCategoryOperations
 from .workflow_documents import (
     DocumentReader,
     documents_of_rows,
@@ -370,6 +371,7 @@ class PromptDatabase(
     DuplicateCopyOperations,
     WorkflowStorageOperations,
     CategoryImportOperations,
+    ImageCategoryOperations,
 ):
     """Database operations class for managing prompts."""