fix: 清除硬编码API Key与机器特定路径，改用环境变量+混合式路径解析

tests/prepare_test_data.py

@@ -1,8 +1,12 @@
 """Prepare test data for Playwright E2E tests."""
+import os
 from pathlib import Path
 
 FIXTURES = Path(__file__).parent / "fixtures"
-COBOL_GIT = Path(r"D:\cobol-java\jcl-cobol-git")
+COBOL_GIT = Path(
+    os.environ.get("COBOL_GIT_ROOT",
+                   Path(__file__).resolve().parent.parent.parent / "jcl-cobol-git")
+)
 
 
 def prepare():