fix: ensure limit parameter is an integer in split_model initialization

--bug=1057597 --user=刘瑞斌 【知识库】通用知识库高级分段生成预览为空 https://www.tapd.cn/62980211/s/1719490

apps/common/utils/split_model.py

@@ -287,6 +287,8 @@ class SplitModel:
     def __init__(self, content_level_pattern, with_filter=True, limit=100000):
         self.content_level_pattern = content_level_pattern
         self.with_filter = with_filter
+        if type(limit) is not int:
+            limit = int(limit)
         if limit is None or limit > 100000:
             limit = 100000
         if limit < 50: