feat(core): 增强 Exchange，实现智能变量替换与类型保持

- 优化 conftest.py 增加异常日志记录和测试报告环境信息
 - 其他优化

core/context.py

@@ -10,7 +10,7 @@
 @desc: 
 """
 from dataclasses import dataclass
-from typing import Dict, Any
+from typing import Any
 from pathlib import Path
 
 from core.exchange import Exchange
@@ -25,7 +25,7 @@ class VariableStore:
         self.seed_file = seed_file
         self.processor = YamlProcessor(seed_file)
         # 启动时仅加载一次
-        self.store: Dict[str, Any] = self.processor.load() or {}
+        self.store: dict[str, Any] = self.processor.load() or {}
 
     def persist(self):
         """测试结束时统一写盘"""