feat(langfuse): 게이트웨이 fabrix 트레이스는 LANGFUSE_TRACE_GATEWAY=1 일 때만 — 질문 하나 = 행 하나 유지

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

5_django_backend/tests/test_gateway.py

@@ -126,7 +126,7 @@ async def test_401_retries_other_auth_shape_and_remembers(upstream):
     assert len(calls) == n + 1 and calls[-1].headers["x-openapi-token"] == "Bearer tok"
 
 
-@override_settings(FABRIX_ENV=FULL_ENV, LANGFUSE={"host": "http://lf.test", "public_key": "pk", "secret_key": "sk"})
+@override_settings(FABRIX_ENV=FULL_ENV, LANGFUSE={"host": "http://lf.test", "public_key": "pk", "secret_key": "sk", "gateway": True})
 async def test_stream_reports_generation_to_langfuse(upstream, monkeypatch):
     import asyncio