v1.1.0: Alembic, pytest, домен и документация

- Миграции PostgreSQL через Alembic; DDL убран из lifespan приложения.
- Тесты: health, status, ingress Grafana; моки Vault/Grafana/Forgejo.
- Пакет onguard24/domain/ (сущности, шина событий), docs/DOMAIN.md.
- Обновлены README, CHANGELOG, ARCHITECTURE.

Made-with: Cursor

tests/test_domain.py

@@ -0,0 +1,22 @@
+import pytest
+
+from onguard24.domain import Alert, AlertReceived, InMemoryEventBus, Severity
+
+
+def test_alert_model() -> None:
+    a = Alert(source="grafana", severity=Severity.CRITICAL, title="x")
+    assert a.source == "grafana"
+
+
+@pytest.mark.asyncio
+async def test_event_bus_alert_received() -> None:
+    seen: list[str] = []
+
+    async def h(ev: AlertReceived) -> None:
+        seen.append(ev.name)
+
+    bus = InMemoryEventBus()
+    bus.subscribe("alert.received", h)  # type: ignore[arg-type]
+    a = Alert(source="grafana")
+    await bus.publish_alert_received(a)
+    assert seen == ["alert.received"]