fix: remove jieba compatibility shim

tests/test_jieba_utils.py

@@ -1,19 +1,9 @@
-import jieba
-
 from app.utils.jieba import cut
 
 
 def test_cut_accepts_legacy_hmm_argument():
-    """验证兼容封装仍支持旧 jieba.cut 的 HMM 参数名。"""
+    """验证分词封装支持旧 jieba.cut 的 HMM 参数名。"""
     words = cut("台湾后台测试", HMM=False)
 
     assert "".join(words) == "台湾后台测试"
     assert "后台" in words
-
-
-def test_legacy_jieba_import_uses_compat_entrypoint():
-    """验证插件仍可通过旧 jieba.cut 入口使用主程序分词实现。"""
-    words = list(jieba.cut("台湾后台测试", HMM=False))
-
-    assert "".join(words) == "台湾后台测试"
-    assert "后台" in words