feat: страница логов /ui/logs с SSE real-time потоком

- log_buffer: RingBufferHandler, кольцевой буфер 600 записей, fan-out SSE
- ui_logs: GET /ui/logs (HTML), GET /ui/logs/stream (EventSource)
- main: install_log_handler при старте, подключён router логов
- nav_rail: ссылка Логи, root_html: кнопка-ссылка Логи
- Исправлено: NaN/Inf/NUL в теле вебхука → 500 от PostgreSQL jsonb
- Тесты: test_log_buffer, test_json_sanitize; 51 passed

Made-with: Cursor

onguard24/ingress/grafana.py

@@ -10,6 +10,7 @@ from starlette.responses import Response
 from onguard24.domain.entities import Alert, Severity
 from onguard24.grafana_sources import sources_by_slug, webhook_authorized
 from onguard24.ingress.grafana_payload import extract_alert_row_from_grafana_body
+from onguard24.ingress.json_sanitize import sanitize_for_jsonb
 from onguard24.ingress.team_match import resolve_team_id_for_labels
 
 logger = logging.getLogger(__name__)
@@ -99,6 +100,8 @@ async def _grafana_webhook_impl(
         body = {}
     if not isinstance(body, dict):
         body = {}
+    else:
+        body = sanitize_for_jsonb(body)
 
     derived = extract_grafana_source_key(body)
     path_key: str | None = None
@@ -131,7 +134,7 @@ async def _grafana_webhook_impl(
                 RETURNING id
                 """,
                 "grafana",
-                json.dumps(body),
+                json.dumps(body, ensure_ascii=False, allow_nan=False),
                 stored_org_slug,
                 service_name,
             )
@@ -151,7 +154,7 @@ async def _grafana_webhook_impl(
                     sev_row,
                     stored_org_slug,
                     service_name,
-                    json.dumps(labels_row),
+                    json.dumps(labels_row, ensure_ascii=False, allow_nan=False),
                     fp_row,
                     team_id,
                 )
@@ -165,12 +168,17 @@ async def _grafana_webhook_impl(
             payload=body,
             received_at=datetime.now(timezone.utc),
         )
-        await bus.publish_alert_received(
-            alert,
-            raw_payload_ref=raw_id,
-            grafana_org_slug=stored_org_slug,
-            service_name=service_name,
-        )
+        try:
+            await bus.publish_alert_received(
+                alert,
+                raw_payload_ref=raw_id,
+                grafana_org_slug=stored_org_slug,
+                service_name=service_name,
+            )
+        except Exception:
+            logger.exception(
+                "ingress: событие alert.received не доставлено подписчикам (БД уже сохранена)"
+            )
     return Response(status_code=202)