feat(grok): 支持 Web SSO 批量导入并转换为 Build OAuth

新增 Grok Web SSO → xAI Device Flow → Grok Build OAuth 导入链路，
支持管理员批量粘贴 SSO key 创建 OAuth 账号。

- 后端：ConvertSSOToBuild、ConvertFromSSO、POST /admin/grok/sso-to-oauth
- 批量：3 worker 并发，失败跳过并汇总 created/failed，worker panic recover
- 无 refresh_token 时写入 expires_at 并强制 auto_pause_on_expired
- 前端：SSO Cookie 导入入口、动态超时、中英文案、部分成功不关弹窗
- 测试：pkg/service/handler/前端超时单测；本地 Docker 真实 SSO e2e 通过

frontend/src/composables/useAccountOAuth.ts

@@ -3,7 +3,7 @@ import { useAppStore } from '@/stores/app'
 import { adminAPI } from '@/api/admin'
 
 export type AddMethod = 'oauth' | 'setup-token'
-export type AuthInputMethod = 'manual' | 'cookie' | 'refresh_token' | 'mobile_refresh_token' | 'session_token' | 'access_token' | 'codex_session' | 'codex_pat'
+export type AuthInputMethod = 'manual' | 'cookie' | 'refresh_token' | 'mobile_refresh_token' | 'session_token' | 'access_token' | 'codex_session' | 'codex_pat' | 'sso_cookie'
 
 export interface OAuthState {
   authUrl: string

frontend/src/composables/useGrokOAuth.ts

@@ -121,6 +121,8 @@ export function useGrokOAuth() {
       client_id: tokenInfo.client_id,
       scope: tokenInfo.scope,
       email: tokenInfo.email,
+      sub: tokenInfo.sub,
+      team_id: tokenInfo.team_id,
       subscription_tier: tokenInfo.subscription_tier,
       entitlement_status: tokenInfo.entitlement_status,
       base_url: 'https://cli-chat-proxy.grok.com/v1'