fix: add data_filter field definition guard to CRUD template

- Check if filterjson is CRUD field definition ({'fields': [...]})
- Set filterjson to None to avoid DBFilter AssertionError
- Fixes issue where data_filter parameter causes 500 error

xls2ddl/tmpls.py

@@ -154,6 +154,9 @@ if filterjson and isinstance(filterjson, str):
 \t\tfilterjson = json.loads(filterjson)
 \texcept (json.JSONDecodeError, TypeError):
 \t\tfilterjson = None
+# data_filter可能是CRUD字段定义({"fields":[...]}),不是过滤条件,忽略
+if filterjson and isinstance(filterjson, dict) and 'fields' in filterjson:
+	filterjson = None
 fields_str=r'''{{json.dumps(fields, indent=4, ensure_ascii=False)}}'''
 ori_fields = json.loads(fields_str)
 if not filterjson: