Reorganize to fastapi template

tests/test_health.py

@@ -0,0 +1,11 @@
+from fastapi.testclient import TestClient
+
+from app.main import app
+
+client = TestClient(app)
+
+
+def test_health() -> None:
+    r = client.get("/api/health")
+    assert r.status_code == 200
+    assert r.json() == {"status": "ok"}