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

tests/test_settings.py

@@ -0,0 +1,50 @@
+"""SettingsStore 单测（封闭：临时路径）。"""
+import json
+
+from gateway.settings import DEFAULTS, SettingsStore, _coerce
+
+
+def test_defaults(tmp_path):
+    s = SettingsStore(path=tmp_path / "s.json")
+    d = s.to_dict()
+    assert d["worker"]["backend"] == "llama_server"
+    assert "pipeline" in d and "architect" in d
+
+
+def test_update_and_coerce(tmp_path):
+    s = SettingsStore(path=tmp_path / "s.json")
+    s.update({"worker": {"backend": "openai", "temperature": "0.4", "max_fix_attempts": "3"}})
+    d = s.to_dict()
+    assert d["worker"]["backend"] == "openai"
+    assert d["worker"]["temperature"] == 0.4      # 字符串转 float
+    assert d["worker"]["max_fix_attempts"] == 3   # 字符串转 int
+
+
+def test_ignores_unknown_keys(tmp_path):
+    s = SettingsStore(path=tmp_path / "s.json")
+    s.update({"worker": {"not_a_key": 1}, "unknown_section": {"x": 1}})
+    d = s.to_dict()
+    assert "not_a_key" not in d["worker"]
+    assert "unknown_section" not in d
+
+
+def test_persistence_roundtrip(tmp_path):
+    p = tmp_path / "s.json"
+    s = SettingsStore(path=p)
+    s.update({"worker": {"temperature": 0.5}})
+    s2 = SettingsStore(path=p)  # 重新加载
+    assert s2.to_dict()["worker"]["temperature"] == 0.5
+
+
+def test_reset(tmp_path):
+    s = SettingsStore(path=tmp_path / "s.json")
+    s.update({"worker": {"backend": "mock"}})
+    d = s.reset()
+    assert d["worker"]["backend"] == "llama_server"
+
+
+def test_coerce():
+    assert _coerce("true", True) is True
+    assert _coerce("42", 0) == 42
+    assert _coerce("bad", 0) == 0
+    assert _coerce(1.5, 0.0) == 1.5