feat: render full agent lifecycle text from notification_body in Telegram

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_telegram_templates.py

@@ -110,6 +110,29 @@ def test_lifecycle_started_template():
     assert "📡 Оповещение: SAC (Security Alert Center)" in text
 
 
+def test_lifecycle_notification_body_renders_full_text():
+    host = Host(hostname="WIN01", display_name="K6A-DC3", os_family="windows")
+    body = "✅ Мониторинг логинов ЗАПУЩЕН\n🖥️ Сервер: K6A-DC3 (10.0.0.1)\n🕐 Время запуска: 28.05.2026 12:00:00"
+    event = Event(
+        event_id="00000000-0000-4000-8000-000000000507",
+        host_id=1,
+        host=host,
+        occurred_at=datetime(2026, 5, 29, 9, 0, tzinfo=timezone.utc),
+        category="agent",
+        type="agent.lifecycle",
+        severity="info",
+        title="started",
+        summary="Мониторинг запущен",
+        details={"lifecycle": "started", "trigger": "boot", "notification_body": body, "telegram_via": "sac"},
+        payload={"source": {"product": "rdp-login-monitor", "product_version": "1.2.31-SAC"}},
+    )
+    text = format_event_telegram_html(event)
+    assert "✅ Мониторинг логинов ЗАПУЩЕН" in text
+    assert "K6A-DC3 (10.0.0.1)" in text
+    assert "Агент запущен" not in text
+    assert "📡 Оповещение: SAC (Security Alert Center)" in text
+
+
 def test_lifecycle_footer_uses_telegram_via_agent_when_present():
     host = Host(hostname="WIN01", display_name="H1", os_family="windows")
     event = Event(