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/cobol_testgen/test_merge_pipeline.py

@@ -7,6 +7,8 @@
 """
 
 import sys, os
+from pathlib import Path
+import pytest
 sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..")))
 
 from cobol_testgen.read import (
@@ -17,8 +19,17 @@ from cobol_testgen.read import (
 from cobol_testgen.core import build_branch_tree
 from cobol_testgen.coverage import collect_decision_points
 
-_SRC = r'C:\Users\marye\Desktop\2026技术大赛\cobol-tna-system\src'
-_CPY = r'C:\Users\marye\Desktop\2026技术大赛\cobol-tna-system\cpy'
+# TNA 测试数据目录: 环境变量优先 → 大赛兄弟目录兜底（见 .env.example）
+_TNA = Path(os.environ.get(
+    "COBOL_TNA_ROOT",
+    Path(__file__).resolve().parent.parent.parent.parent / "cobol-tna-system",
+))
+_SRC = str(_TNA / "src")
+_CPY = str(_TNA / "cpy")
+
+pytestmark = pytest.mark.skipif(
+    not _TNA.exists(), reason=f"TNA test data not found: {_TNA} (set COBOL_TNA_ROOT)"
+)
 
 
 def _load(pid):