feat: T03+T04 backend - FastAPI, DB models, Rentman integration, admin auth, APScheduler

backend/tests/test_health.py

@@ -0,0 +1,12 @@
+"""Tests for health endpoint (T03)."""
+import pytest
+
+
+@pytest.mark.asyncio
+async def test_health_endpoint(client):
+    resp = await client.get("/api/health")
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["status"] == "ok"
+    assert "db" in data
+    assert "redis" in data