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

test-data/s19_final_bridge_test.py

@@ -2,7 +2,7 @@
 import sys, os, re, time
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
 
-ROOT = "D:/cobol-java/cobol-test-programs/"
+from _paths import BENCH_ROOT as ROOT
 COPYBOOKS = os.path.join(ROOT, "common", "copybooks")
 from cobol_testgen import extract_structure, generate_data
 from cobol_testgen.read import preprocess, resolve_copybooks