fix(data): Task 1 review 修复（pycache清理+pytest.ini+错误处理）

- Fix 1: 移除误 commit 的 __pycache__ 文件
- Fix 2: 创建 pytest.ini 解决 PYTHONPATH 问题
- Fix 3: load_config 添加错误处理（FileNotFoundError + ValueError）

Co-Authored-By: Claude <noreply@anthropic.com>

pytest.ini

@@ -0,0 +1,3 @@
+[pytest]
+pythonpath = .
+testpaths = tests

sanguo_data/config.py

@@ -10,8 +10,17 @@ class DataConfig:
     performance: dict
 
 def load_config(path: str) -> DataConfig:
-    with open(path, "r", encoding="utf-8") as f:
-        raw = yaml.safe_load(f)
+    try:
+        with open(path, "r", encoding="utf-8") as f:
+            raw = yaml.safe_load(f)
+    except FileNotFoundError:
+        raise FileNotFoundError(f"配置文件不存在: {path}")
+    except yaml.YAMLError as e:
+        raise ValueError(f"YAML解析失败: {e}")
+
+    if not raw:
+        raise ValueError(f"配置文件为空: {path}")
+
     return DataConfig(
         data_paths=raw.get("data_paths", {}),
         data_sources=raw.get("data_sources", {}),

tests/data/test_config.py

@@ -1,4 +1,5 @@
 # tests/data/test_config.py
+import pytest
 from sanguo_data.config import load_config, DataConfig
 
 def test_load_config_returns_dataconfig(tmp_path):
@@ -25,3 +26,7 @@ performance:
     assert cfg.data_paths["daily_dir"] == "/tmp/daily"
     assert cfg.data_sources["daily"][0]["name"] == "eastmoney"
     assert cfg.performance["max_retries"] == 3
+
+def test_load_config_raises_on_missing_file():
+    with pytest.raises(FileNotFoundError, match="配置文件不存在"):
+        load_config("/nonexistent/path/config.yaml")