fix(paper): 实走/影子隐藏起止日期(用户指正:开放账户区间无意义): 前端仅回放显示日期,卡片标题资金与区间→资金+说明文案; 后端非回放强制start=创建当天end空(组合日终重放依赖start_date空值会崩); 区间断言进测试 [nas]

tests/api/test_paper_routes.py

@@ -63,8 +63,14 @@ def test_create_shadow_mode(tmp_path):
     cta = by_id[r1.json()["account_id"]]
     assert cta["mode"] == "shadow"
     assert cta["engine"] == "shadow"
+    # 实走/影子是开放账户:用户填的区间被忽略,开始=创建当天,结束留空
+    from datetime import date
+
+    assert cta["start_date"] == date.today().isoformat()
+    assert not cta["end_date"]
     pf = by_id[r2.json()["account_id"]]
     assert pf["mode"] == "shadow" and pf["engine"] == "shadow"
+    assert not pf["end_date"]
 
 
 def test_create_portfolio_rejects_replay(tmp_path):