Update docs and screenshots

backend/tests/test_ofl_client.py

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+import asyncio
+
+import httpx
+
+from app.fixtures.ofl import OflClient
+
+
+def test_fetch_fixture_uses_json_endpoint(monkeypatch) -> None:
+    requested_urls: list[str] = []
+
+    class FakeResponse:
+        def raise_for_status(self) -> None:
+            return None
+
+        def json(self) -> dict[str, object]:
+            return {"name": "LED Bar-3 HCL Bar", "modes": []}
+
+    class FakeAsyncClient:
+        def __init__(self, *args, **kwargs) -> None:
+            pass
+
+        async def __aenter__(self) -> "FakeAsyncClient":
+            return self
+
+        async def __aexit__(self, exc_type, exc, tb) -> None:
+            return None
+
+        async def get(self, url: str) -> FakeResponse:
+            requested_urls.append(url)
+            return FakeResponse()
+
+    monkeypatch.setattr(httpx, "AsyncClient", FakeAsyncClient)
+
+    payload = asyncio.run(OflClient().fetch_fixture("eurolite", "led-bar-3-hcl-bar"))
+
+    assert payload["name"] == "LED Bar-3 HCL Bar"
+    assert requested_urls == ["https://open-fixture-library.org/eurolite/led-bar-3-hcl-bar.json"]