[FEATURE] add OPA on pixiu-admin

[AlexStocks]

✅ 验证清单

• [x] 🔍 我已经搜索过 现有 Issues，确信这不是重复请求
• [x] 📋 我已经查看了 发布说明，确信此功能尚未实现

🎯 功能描述

在 pixiu-admin 上配置 OPA 的配置

📋 使用场景

动态允许或者拒绝某个路径

⚖️ 复杂性与风险评估

No response

🔗 外部依赖

No response

📚 附加信息

No response

[AlexStocks]

@nanjiek

[1kasa]

@sirui

[Alanxtl]

https://github.com/apache/dubbo-go-pixiu/pull/843 https://github.com/apache/dubbo-go-pixiu/pull/822 https://github.com/apache/dubbo-go-pixiu/pull/751 https://github.com/apache/dubbo-go-pixiu/pull/732