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/test_golden.py

@@ -1,12 +1,12 @@
 """
 Golden tests — 对接真实 COBOL 信用卡月结系统
-数据源: D:\cobol-java\jcl-cobol-git\
+数据源: COBOL_GIT_ROOT 环境变量指定的 jcl-cobol-git 目录
 验证目标: 28 transactions → 20 valid + 8 rejected → 6 cards → ¥48,250.20 total
 """
 import sys, os
-sys.path.insert(0, r"D:\cobol-java\v3-gstack-code-gen")
-
 from pathlib import Path
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
 from data.field_tree import Field, FieldTree
 from comparator.cobol_binary_reader import CobolBinaryReader
 from comparator.normalizer import Normalizer
@@ -14,7 +14,10 @@ from comparator.field_compare import compare_field
 from comparator.aligner import align_records
 from preprocessor import CopybookPreprocessor
 
-GOLDEN = Path(r"D:\cobol-java\jcl-cobol-git")
+GOLDEN = Path(
+    os.environ.get("COBOL_GIT_ROOT",
+                   Path(__file__).resolve().parent.parent.parent / "jcl-cobol-git")
+)
 
 
 # ── Test 1: TXCPY COPYBOOK 结构验证 ──