feat(data): 恢复双源(task#79)—撮合raw+策略qfq, 分红除权准确

用户要模拟=回测准确: raw除权缺口致MA假信号, 必须双源。
- data_source: qfq→qfq_dir(干净qfq), raw→raw_dir; _check_adjust_cfg(cfg提供才校验)
- engine 双bar流: step(raw_bars,qfq_bars)撮合/盯市raw+策略on_bar qfq; run zip(raw,qfq)
- live_orchestrator: warmup用qfq(信号am); 去adjust参数(双源固定)
- raw_redownload --adjust(''raw/'qfq'); config qfq_dir
- 113/113通过

tests/trader/test_data_source.py

@@ -34,7 +34,7 @@ def test_iter_bars_cross_section_multi_symbol(monkeypatch):
     assert len(sections) == 1
     _date, d = sections[0]
     assert d["600000"].close_price == 10.5
-    assert all(k == "daily_dir" for k in seen)   # 默认 qfq → daily_dir
+    assert all(k == "qfq_dir" for k in seen)   # 默认 qfq → qfq_dir（双源）
 
 
 def test_iter_bars_raw_uses_raw_dir(monkeypatch, caplog):
@@ -90,4 +90,4 @@ def test_fetch_day_returns_last_bar(monkeypatch):
     monkeypatch.setattr("sanguo_trader.data_source._read_fn", lambda iv: mock_read)
     bar = fetch_day("600000", "2024-01-02", "d")
     assert bar.close_price == 10.5   # 取最后一个
-    assert seen == ["daily_dir"]
+    assert seen == ["qfq_dir"]  # 默认 qfq → qfq_dir（双源）