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/s14_benchmark_suite.py

@@ -5,7 +5,7 @@ P=0;F=0;BUGS=[]
 def ck(v,m=""): global P,F; (P:=P+1) if v else (F:=F+1,BUGS.append(m))
 def sec(n): print(f"\n--- {n} ---")
 
-ROOT = "D:/cobol-java/cobol-test-programs/"
+from _paths import BENCH_ROOT as ROOT
 from cobol_testgen import extract_structure, generate_data
 from hina.pipeline.pipeline import classify_program
 from hina.classifier import detect_keyword