chore: remove newline character from split characters in split_model.py

apps/common/utils/split_model.py

@@ -300,8 +300,9 @@ def smart_split_paragraph(content: str, limit: int):
 
         # 优先级:句号 > 感叹号/问号 > 回车
         split_chars = [
-            ('。', 0), ('!', 0), ('?', 0),  # 句子结束符,包含在当前段
-            ('\n', 0),  # 回车符
+            ('。', 0), ('.', 0),  # 中英文句号
+            ('!', 0), ('!', 0),   # 中英文感叹号
+            ('?', 0), ('?', 0),   # 中英文问号
         ]
 
         # 从后往前找分割点