fix(photos): копия фото не наследует отредактированную версию

Clone переносил все привязки photo_objects, включая роли edit*, хотя
правка принадлежит фото, чьи правки её породили. Теперь копия делит
только обычные варианты и показывается в исходном виде.

- EditRoles() и IsEditRole() в edit_render.go — единый список ролей;
- фильтр edit-ролей в Store.Clone и SQLiteStore.Clone;
- миграции 000016 (Postgres) и 000008 (SQLite) убирают привязки у
  копий, созданных до фикса;
- контрактная проверка копирования, сервисные и e2e-тесты.

backend/migrations/000016_photo_edit_copy_bindings.down.sql

@@ -0,0 +1,3 @@
+-- The removed bindings cannot be restored: which object belonged to which copy
+-- is not recorded anywhere. Rollback of the code is enough - the edited
+-- versions of the photos that own them stay untouched.

backend/migrations/000016_photo_edit_copy_bindings.up.sql

@@ -0,0 +1,10 @@
+-- The edited version belongs to the photo whose edits produced it. Copies made
+-- before the fix still carried the edit bindings, so a photo without edit
+-- parameters showed the edited picture. Drop those bindings: the objects
+-- become collectable garbage and the copies show the original picture again.
+
+DELETE FROM photo_objects
+WHERE role IN ('edit', 'edit_thumb', 'edit_medium', 'edit_preview')
+  AND photo_id IN (
+    SELECT id FROM photos WHERE edit_params IS NULL OR edit_params = '{}'::jsonb
+  );

backend/migrations/sqlite/000008_photo_edit_copy_bindings.down.sql

@@ -0,0 +1,3 @@
+-- The removed bindings cannot be restored: which object belonged to which copy
+-- is not recorded anywhere. Rollback of the code is enough - the edited
+-- versions of the photos that own them stay untouched.

backend/migrations/sqlite/000008_photo_edit_copy_bindings.up.sql

@@ -0,0 +1,10 @@
+-- The edited version belongs to the photo whose edits produced it. Copies made
+-- before the fix still carried the edit bindings, so a photo without edit
+-- parameters showed the edited picture. Drop those bindings: the objects
+-- become collectable garbage and the copies show the original picture again.
+
+DELETE FROM photo_objects
+WHERE role IN ('edit', 'edit_thumb', 'edit_medium', 'edit_preview')
+  AND photo_id IN (
+    SELECT id FROM photos WHERE edit_params IS NULL OR edit_params = '{}'
+  );