fix(permission): 修复权限常量解析操作符索引错误 (#4275)

- 修正了权限字符串解析时操作符索引，从原来的第三部分改为第二部分
- 确保权限实例创建时操作符获取正确
- 改善权限常量解析的准确性和稳定性

Co-authored-by: 王旭辉 <[email protected]>

Author: sometimecry

apps/common/constants/permission_constants.py

@@ -429,7 +429,7 @@ def __init__(self, group: Group, operate: Operate, resource_path=None, role_list
     def new_instance(permission_str: str):
         permission_split = permission_str.split(":")
         group = Group[permission_split[0]]
-        operate = Operate[permission_split[2]]
+        operate = Operate[permission_split[1]]
         if len(permission_split) > 2:
             dynamic_tag = ":".join(permission_split[2:])
             return Permission(group, operate, dynamic_tag)