fix(permission): 修复权限常量解析操作符索引错误

[sometimecry]

• 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

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