feat(data): 脚手架 + YAML 配置加载

tests/data/__init__.py

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+# tests/data/__init__.py

tests/data/test_config.py

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+# tests/data/test_config.py
+from sanguo_data.config import load_config, DataConfig
+
+def test_load_config_returns_dataconfig(tmp_path):
+    yaml_content = """
+data_paths:
+  daily_dir: /tmp/daily
+  minute_15_dir: /tmp/15min
+  vnpy_db: /tmp/quant.db
+  stock_list: /tmp/stock.csv
+data_sources:
+  daily:
+    - name: eastmoney
+      enabled: true
+      interval: 4.0
+validation:
+  price_positive: true
+performance:
+  max_retries: 3
+"""
+    p = tmp_path / "config.yaml"
+    p.write_text(yaml_content)
+    cfg = load_config(str(p))
+    assert isinstance(cfg, DataConfig)
+    assert cfg.data_paths["daily_dir"] == "/tmp/daily"
+    assert cfg.data_sources["daily"][0]["name"] == "eastmoney"
+    assert cfg.performance["max_retries"] == 3