• I have searched the issues of this repository and believe that this is not a duplicate.

Ⅰ. Issue Description

2.1.8版本，使用AI网关管理>MCP管理。建立DB类型的MCP server时，无法录入密码带@字符的实例

Ⅱ. Describe what happened

录入DB类型的mcp，且密码带@符号时，会引发mcp.form.databaseConfigInvalid的前端异常，提示“数据库配置格式不正确”。通过代码查看，与以下正则验证相关

If there is an exception, please attach the exception trace:
frontend/src/pages/mcp/constant.ts

  MYSQL: /^(\w+):([^@]+)@tcp\(([^:]+):(\d+)\)\/([^?]+)\?(.+)$/,

Ⅲ. Describe what you expected to happen

在确保dsn格式正确的情况下，兼容含特殊字符的mysql密码

Ⅳ. How to reproduce it (as minimally and precisely as possible)

1. 建立服务来源，填入mysql地址
2. 在AI网关管理>MCP管理中，创建类型为db的mcp server
3. 填入带@符号的mysql密码

Ⅴ. Anything else we need to know?

Ⅵ. Environment:

• Higress version: 2.1.8
• OS :
• Others: