feat: connect chat endpoint to verified retrieval

backend/tests/test_catalog.py

@@ -59,12 +59,28 @@ def review(client, item, status="verified"):
     )
 
 
-def test_health_docs_and_stub(client):
+def test_health_docs_and_chat_without_evidence(client):
     assert client.get("/api/health").json()["status"] == "ok"
     assert client.get("/api/ready").json()["database"] == "connected"
     assert client.get("/docs").status_code == 200
     assert "/api/knowledge/{item_id}/review" in client.get("/openapi.json").json()["paths"]
-    assert client.post("/api/chat", json={"question": "测试"}).json()["status"] == "stub"
+    response = client.post("/api/chat", json={"question": "测试"})
+    assert response.status_code == 200
+    assert response.json()["status"] == "no_evidence"
+
+
+def test_chat_returns_real_retrieval_evidence_without_generation(client):
+    item = knowledge(client, title="那拉提测试资料", content="那拉提文旅服务测试依据")
+    assert review(client, item).status_code == 200
+
+    response = client.post("/api/chat", json={"question": "那拉提文旅服务"})
+
+    assert response.status_code == 200
+    body = response.json()
+    assert body["status"] == "retrieval_only"
+    assert "不生成" in body["answer"]
+    assert body["retrieval_run_id"]
+    assert body["sources"] == [{"title": "那拉提测试资料", "source_url": "https://example.com/"}]
 
 
 def test_legacy_create_and_missing_evidence(client):