chore: 重构前基线 — 9 个 sync task 全部 ok + akshare 移除 + mairui 资金流接入

状态：
- 9 个 sync task（stock_basic / kline_daily / kline_index / kline_5min /
  moneyflow / industry_sector / sector_features / share_snapshot / market_regime）
- 数据源：baostock + mairui + 雪球(pysnowball) + 新浪（4 个）
- 项目级约束：永远不用 akshare（已落实）
- kline_5min 改用 DB 快照统一全量/增量逻辑
- 零后端 Chrome 扩展 xueqiu_sync（独立项目）

tests/__init__.py

@@ -0,0 +1 @@
+"""tests 包标记。"""

tests/conftest.py

@@ -0,0 +1,10 @@
+"""pytest 配置：让测试可以直接 `import app`。
+
+只要把 tests/ 和 app/ 都放进 sys.path 即可。
+"""
+import sys
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))

tests/test_smoke.py

@@ -0,0 +1,93 @@
+"""冒烟测试：不依赖 MySQL/网络，只验证 import + 基本逻辑。
+
+跑：pytest tests/test_smoke.py -v
+"""
+import pytest
+
+
+def test_import_config():
+    from app.core.config import settings
+    assert settings is not None
+    assert hasattr(settings, "mysql_host")
+
+
+def test_import_data_source_base():
+    from app.core.datasource.base import DataSource, FetchResult, registry
+    assert DataSource is not None
+    assert FetchResult is not None
+    assert registry is not None
+    # registry 应该是 dict-like
+    assert hasattr(registry, "register")
+    assert hasattr(registry, "get")
+
+
+def test_import_sync_base():
+    from app.core.sync.base import SyncTask, _is_market_closed, _effective_sync_end
+    assert SyncTask is not None
+    assert isinstance(_is_market_closed(), bool)
+    assert isinstance(_effective_sync_end(), str)
+    # 同步任务基类不允许空 dataset_id
+    with pytest.raises(ValueError):
+        SyncTask()
+
+
+def test_tasks_registry():
+    from app.tasks import TASKS, get_task
+    assert isinstance(TASKS, dict)
+    # 注：每次新增 task 都要更新这里的数字
+    # 当前 9 个：stock_basic, kline_daily, kline_index, kline_5min, moneyflow,
+    #         industry_sector, sector_features, share_snapshot, market_regime
+    assert len(TASKS) == 9
+    # get_task 应该返回实例
+    task = get_task("kline_daily")
+    assert task.dataset_id == "kline_daily"
+
+
+def test_sync_definitions():
+    from app.core.sync.registry import SYNC_DEFINITIONS
+    assert len(SYNC_DEFINITIONS) == 9
+    # 所有 dataset_id 应唯一
+    ids = [d["dataset_id"] for d in SYNC_DEFINITIONS]
+    assert len(set(ids)) == 9
+
+
+def test_build_default_registry():
+    """不连接网络，只看是否能完成注册（部分源 may not available 不影响注册）。"""
+    from app.core.datasource.base import registry
+    from app.core.datasource.registry import build_default_registry
+    build_default_registry()
+    keys = [s.key for s in registry.all()]
+    assert "datasource_xinlang" in keys
+    assert "datasource_baostock" in keys
+    assert "datasource_mairui" in keys
+    # akshare 已移除（项目级决策：永远不用）
+    assert "datasource_akshare" not in keys
+    assert "datasource_xueqiu" in keys
+
+
+def test_data_source_abstract():
+    """DataSource 抽象方法未实现时不应能被直接实例化。"""
+    from app.core.datasource.base import DataSource
+    with pytest.raises(TypeError):
+        DataSource()  # 抽象方法未实现
+
+
+def test_api_health_route():
+    """FastAPI 加载 + /api/health 路由可访问。"""
+    from fastapi.testclient import TestClient
+    from app.api.main import app
+
+    client = TestClient(app)
+    resp = client.get("/api/health")
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body.get("status") == "ok"
+
+
+def test_effective_sync_end_format():
+    from app.core.sync.base import _effective_sync_end
+    s = _effective_sync_end()
+    # YYYY-MM-DD 共 10 字符
+    assert len(s) == 10
+    assert s[4] == "-"
+    assert s[7] == "-"