fix(backups): отклонять восстановление старых частичных экспортов

docs/ux-ui/acceptance/legacy234-catalog.json

@@ -0,0 +1,10 @@
+{
+  "date": "2026-10-14",
+  "block": "12.5.234",
+  "total": 10,
+  "legacySynthetic": 0,
+  "nativeHeader": 0,
+  "other": 0,
+  "missing": 10,
+  "configurationWrites": 0
+}