新增 SignalScout 首页工作台

tests/test_api_health.py

@@ -11,3 +11,13 @@ def test_health_endpoint_returns_app_identity() -> None:
     assert response.status_code == 200
     assert response.json()["status"] == "ok"
     assert response.json()["app"] == "SignalScout"
+
+
+def test_home_page_returns_dashboard_shell() -> None:
+    # 根路径应该展示业务工作台，而不是返回接口404。
+    with TestClient(create_app()) as client:
+        response = client.get("/")
+
+    assert response.status_code == 200
+    assert "SignalScout" in response.text
+    assert "今日 AI 情报" in response.text