fix(backups): показать отсутствие файлов и защитить удаление записей

docs/ux-ui/acceptance/backup-availability237.json

@@ -0,0 +1,40 @@
+{
+  "date": "2026-10-14",
+  "block": "12.5.237",
+  "passed": true,
+  "checks": [
+    {
+      "listStates": {
+        "directory237": "unknown",
+        "remote237": "not-stored",
+        "both237": "missing",
+        "missing237": "missing",
+        "available237": "available"
+      }
+    },
+    {
+      "availableDownload": 200
+    },
+    {
+      "missingDownload": 404
+    },
+    {
+      "missingRestore": 400,
+      "outcome": "not-applied",
+      "nativeRequests": 0
+    },
+    {
+      "failurePreservesCatalog": true
+    },
+    {
+      "recreatedFilePreserved": 409
+    },
+    {
+      "missingRecordDeletion": 204,
+      "mode": "record-only"
+    }
+  ],
+  "externalS3Contacts": 0,
+  "chrContacts": 0,
+  "ownedDatabaseAndRoleRemoved": true
+}