fix: SSH update log modal shows completion and full tail (v0.5.6)

Fetch final update_script.log tail after agent-update, update title/message on success, show log by default; auto-close after 30s unchanged.

backend/tests/test_linux_admin_settings.py

@@ -174,3 +174,51 @@ def test_host_agent_update_success(jwt_headers, client, db_session, monkeypatch)
     assert job["target"] == "ubabuba"
     if "product_version" in job:
         assert job["product_version"] is None or isinstance(job["product_version"], str)
+
+
+def test_host_agent_update_job_shows_log_tail_and_completion_title(
+    jwt_headers, client, db_session, monkeypatch
+):
+    monkeypatch.setenv("SAC_LINUX_ADMIN_USER", "root")
+    monkeypatch.setenv("SAC_LINUX_ADMIN_PASSWORD", "pw")
+    from app.config import get_settings
+    from app.models import Host
+    from app.services.ssh_connect import SshCommandResult
+    from tests.test_agent_update import wait_remote_job
+
+    get_settings.cache_clear()
+
+    host = Host(hostname="router", os_family="linux", product="ssh-monitor", ipv4="10.0.0.1")
+    db_session.add(host)
+    db_session.commit()
+    db_session.refresh(host)
+
+    log_tail = (
+        "2026-07-08 14:18:15 INFO: === Script update completed successfully ===\n"
+        "2026-07-08 14:18:15 INFO: завершено успешно (код 0). Итог см. выше\n"
+    )
+    with (
+        patch("app.services.host_remote_actions.run_ssh_monitor_update") as mock_update,
+        patch("app.services.host_remote_actions.tail_ssh_monitor_update_log") as mock_tail,
+    ):
+        mock_update.return_value = SshCommandResult(
+            ok=True,
+            message="SSH OK (router), exit 0",
+            target="router",
+            stdout="",
+            exit_code=0,
+            agent_version="2.3.2-SAC",
+        )
+        mock_tail.return_value = log_tail
+        response = client.post(
+            f"/api/v1/hosts/{host.id}/actions/agent-update",
+            headers=jwt_headers,
+        )
+
+    assert response.status_code == 202
+    job = wait_remote_job(client, host.id, jwt_headers)
+    assert job["ok"] is True
+    assert "готово" in (job.get("title") or "")
+    assert "2.3.2-SAC" in (job.get("message") or "")
+    assert "Script update completed successfully" in (job.get("output") or "")
+    mock_tail.assert_called()