🐛[BUG] 内置 Steam 令牌功能无法通过 Steam 账户导入令牌

## 请认真检查以下清单中的每一项
- [ √] 已经搜索过，没有发现类似的 issue
- [ √] 已经搜索过文档，没有发现相关内容
- [ √] 已经尝试使用过最新版，问题依旧存在
- [ √] 使用的是官方版本（未替换及修改过安装目录程序文件）

### 🐛 描述

当我在尝试通过 “Steam 账号导入” 功能导入 Steam 令牌时，提示
"Error enrolling new authenticator
The remote server returned an error: (404) Not Found.
The remote server returned an error: (404) Not Found."
已开启加速器且非共享加速器；确定节点可以与 Steam 伺服器通讯

### 📷 复现步骤

1. 启动 Watt Tookit
2. 在“令牌”页面点击“新增”
3. 通过 ”Steam 账号导入“ 导入令牌

### 📄 日志信息
WinAuth.WinAuthInvalidRequestException: The remote server returned an error: (404) Not Found.
---> System.Net.WebException: The remote server returned an error: (404) Not Found.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.WebRequest.<>c.b__68_2(IAsyncResult iar)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
at System.Application.UI.ViewModels.AddAuthWindowViewModel.LoginSteamImport()
2023-04-23 00:44:02.1348|Error|AddAuthWindowViewModel|LoginSteamImport | WinAuth.WinAuthInvalidEnrollResponseException: Error enrolling new authenticator
---> WinAuth.WinAuthInvalidRequestException: The remote server returned an error: (404) Not Found.
---> System.Net.WebException: The remote server returned an error: (404) Not Found.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.WebRequest.<>c.b__68_2(IAsyncResult iar)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
at System.Application.UI.ViewModels.AddAuthWindowViewModel.LoginSteamImport()
2023-04-23 00:44:10.4634|Error|AddAuthWindowViewModel|LoginSteamImport | WinAuth.WinAuthInvalidEnrollResponseException: Error enrolling new authenticator
---> WinAuth.WinAuthInvalidRequestException: The remote server returned an error: (404) Not Found.
---> System.Net.WebException: The remote server returned an error: (404) Not Found.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.WebRequest.<>c.b__68_2(IAsyncResult iar)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
at System.Application.UI.ViewModels.AddAuthWindowViewModel.LoginSteamImport()
2023-04-23 00:44:40.9430|Error|AddAuthWindowViewModel|LoginSteamImport | WinAuth.WinAuthInvalidEnrollResponseException: Error enrolling new authenticator
---> WinAuth.WinAuthInvalidRequestException: The remote server returned an error: (404) Not Found.
---> System.Net.WebException: The remote server returned an error: (404) Not Found.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.WebRequest.<>c.b__68_2(IAsyncResult iar)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
at System.Application.UI.ViewModels.AddAuthWindowViewModel.LoginSteamImport()
2023-04-23 00:44:44.1230|Error|AddAuthWindowViewModel|LoginSteamImport | WinAuth.WinAuthInvalidEnrollResponseException: Error enrolling new authenticator
---> WinAuth.WinAuthInvalidRequestException: The remote server returned an error: (404) Not Found.
---> System.Net.WebException: The remote server returned an error: (404) Not Found.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.WebRequest.<>c.b__68_2(IAsyncResult iar)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
at System.Application.UI.ViewModels.AddAuthWindowViewModel.LoginSteamImport()
2023-04-23 01:24:02.4954|Error|AddAuthWindowViewModel|LoginSteamImport | WinAuth.WinAuthInvalidEnrollResponseException: Error enrolling new authenticator
---> WinAuth.WinAuthInvalidRequestException: The remote server returned an error: (404) Not Found.
---> System.Net.WebException: The remote server returned an error: (404) Not Found.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.WebRequest.<>c.b__68_2(IAsyncResult iar)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Request(String url, String method, NameValueCollection data, CookieContainer cookies, NameValueCollection headers, Int32 timeout)
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
--- End of inner exception stack trace ---
at System.Application.Models.GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll(EnrollState state)
at System.Application.UI.ViewModels.AddAuthWindowViewModel.LoginSteamImport()
`

-->

### 🖼 截图


### 🚑 其他信息

- 处理器体系结构： x64
- 系统版本号： Windows 11 Professional 22621.1413
- 下载渠道： GitHub
- 程序版本：2.8.6
- 是否包含独立运行时：包含

Start at AddAuthWindowViewModel.LoginSteamImport and follow GAPAuthenticatorValueDTO.SteamAuthenticator.Enroll and Request while reproducing the Steam account import flow that returns 404. Done means Steam token import completes without the enrollment error; the issue names no test file.

Written by the indexing model from the issue text.