Initial MobilityOps build pack (docs, contracts, scaffold)

backend/tests/test_health.py

@@ -0,0 +1,9 @@
+from fastapi.testclient import TestClient
+
+from app.main import app
+
+
+def test_health() -> None:
+    response = TestClient(app).get("/health")
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok", "service": "mobilityops-api"}