test: add unit test suite for config, health checks, and lifespan wiring

tests/unit/test_readyz.py

@@ -0,0 +1,17 @@
+import pytest
+from httpx import AsyncClient
+
+pytestmark = [pytest.mark.unit, pytest.mark.asyncio]
+
+
+async def test_readyz_reports_all_dependencies_not_ready_without_docker(
+    client: AsyncClient,
+) -> None:
+    response = await client.get("/readyz")
+
+    assert response.status_code == 503
+    assert response.json() == {
+        "postgres": False,
+        "minio": False,
+        "qdrant": False,
+    }