fix(backups): отделить результат операций от ошибок журнала

shared/api/backups.test.ts

@@ -44,6 +44,7 @@ test("invalid mutations fail before HTTP; create receives job acknowledgment", a
     assert.equal(calls, 0)
     assert.equal((await createBackupsAsync(base, { serverIds: ["1"], notes: "manual" })).jobId, "job-1")
     assert.deepEqual(body, { serverIds: ["1"], notes: "manual" })
+    globalThis.fetch = async () => json({ jobId: "job-1", status: "queued", total: 2, completed: 0 }, 202); await assert.rejects(() => createBackupsAsync(base, { serverIds: ["1"] }), /всех выбранных/);
     globalThis.fetch = async () => json({ created: [item], failures: [] }); await assert.rejects(() => createBackupsAsync(base, { serverIds: ["1"] }))
   } finally { globalThis.fetch = original }
 })