fix(backups): получать нативный экспорт и проверить восстановление из S3

docs/ux-ui/acceptance/s3-native230-first.json

@@ -0,0 +1,56 @@
+{
+  "date": "2026-10-14",
+  "block": "12.5.230",
+  "prefix": "mmapp-acceptance/a395b3db-8f34-4335-ae67-9a635f5e7c6a",
+  "passed": false,
+  "backups": [
+    {
+      "serverId": 1,
+      "host": "194.226.121.150",
+      "bytes": 1063,
+      "sha256": "efa4f3e6c86cf9bb3d4941a472018bbb82c945bef7df9e93321191034eab059b",
+      "native": true,
+      "s3Only": true
+    },
+    {
+      "serverId": 2,
+      "host": "104.165.244.7",
+      "bytes": 782,
+      "sha256": "47f1f0da003c31cdce61f84ff1f30c49a119f319042d7eca54de77d6ed800b5c",
+      "native": true,
+      "s3Only": true
+    }
+  ],
+  "checks": [
+    {
+      "name": "two-native-backups-S3-and-download",
+      "passed": true
+    },
+    {
+      "name": "limited-restore-payload-only-native-marker-command",
+      "passed": true
+    },
+    {
+      "name": "S3-download-upload-import-native-readback",
+      "passed": true
+    }
+  ],
+  "cleanup": [
+    {
+      "host": "194.226.121.150",
+      "failureName": "AssertionError"
+    },
+    {
+      "host": "104.165.244.7",
+      "originalFilesAndBridgesMatched": true
+    }
+  ],
+  "passwordChanges": 0,
+  "currentS3ObjectsRemaining": 0,
+  "bounds": [
+    "Full .rsc import onto a configured router was not attempted; restore only own unused bridge",
+    "Current objects removed; own S3 versions require separate cleanup",
+    "Files>=61439 bytes explicitly rejected pending chunked-reader work"
+  ],
+  "ownedDatabaseAndRoleRemoved": true
+}