更新最新版之后，证书列表找不到了，新增证书报错 #1034
Description
Describe the bug
在2.0.0-rc.5创建的证书消失了，新增证书报错
To Reproduce
Steps to reproduce the behavior:
- Go to '证书'
- Click on '证书列表'
- 点击导入
- 按照表单提示，输入证书名称，证书路径，证书key路径
Expected behavior
应该新增成功
Screenshots
Info (please complete the following information):
- Server OS: Ubuntu 24.04
- Server Arch: x86
- Nginx UI Version: 在2.0.0-rc.6（418）
- Your Browser: Chrome
Additional context
后台日志报错信息
2025/05/09 20:03:39 /home/runner/work/nginx-ui/nginx-ui/internal/user/user.go:56
[0.214ms] [rows:1] SELECT * FROM `users` WHERE id=1 AND `users`.`deleted_at` IS NULL LIMIT 1
2025-05-09 20:03:39 ERROR /home/runner/go/pkg/mod/github.com/uozi-tech/cosy@v1.21.1/router/middleware.go:16 interface conversion: interface {} is nil, not string
goroutine 633 [running]:
github.com/uozi-tech/cosy/router.Init.recovery.func2.1()
/home/runner/go/pkg/mod/github.com/uozi-tech/cosy@v1.21.1/router/middleware.go:15 +0x65
panic({0x3d28ee0?, 0xc000364a80?})
/opt/hostedtoolcache/go/1.24.2/x64/src/runtime/panic.go:792 +0x132
github.com/0xJacky/Nginx-UI/api/certificate.AddCert.func1(0xc000effb08)
/home/runner/work/nginx-ui/nginx-ui/api/certificate/certificate.go:106 +0x1fb
github.com/uozi-tech/cosy.(*Ctx[...]).beforeExecuteHook(...)
/home/runner/go/pkg/mod/github.com/uozi-tech/cosy@v1.21.1/hook.go:13
github.com/uozi-tech/cosy.(*Ctx[...]).Create(0x5593800)
/home/runner/go/pkg/mod/github.com/uozi-tech/cosy@v1.21.1/create.go:41 +0x657
github.com/0xJacky/Nginx-UI/api/certificate.AddCert(0xc000a0d200)
/home/runner/work/nginx-ui/nginx-ui/api/certificate/certificate.go:147 +0x7cf
github.com/gin-gonic/gin.(*Context).Next(0xc000a0d200)
/home/runner/go/pkg/mod/github.com/gin-gonic/gin@v1.10.0/context.go:185 +0x2b
github.com/0xJacky/Nginx-UI/router.InitRouter.Proxy.fu