feat(v2): 模型设置（用户可调小模型/大模型/管线，/config + UI）

tests/test_gateway.py

@@ -66,6 +66,24 @@ def test_metrics(client):
     assert "review" in data
 
 
+
+
+
+def test_config_get_put_reset(client):
+    # GET 默认
+    r = client.get("/config")
+    assert r.status_code == 200
+    assert r.json()["worker"]["backend"] in ("llama_server", "openai", "mock")
+    # PUT 更新 worker
+    r2 = client.put("/config", json={"worker": {"backend": "mock", "temperature": 0.5}})
+    assert r2.status_code == 200
+    assert r2.json()["worker"]["temperature"] == 0.5
+    # 重置
+    r3 = client.post("/config/reset")
+    assert r3.status_code == 200
+    assert r3.json()["worker"]["backend"] == "llama_server"
+
+
 def test_workspace_not_found(client):
     resp = client.get("/runs/nonexistent/workspace")
     assert resp.status_code == 404