feat(openai): 新增"手动输入 Mobile RT"入口，使用 SoraClientID 刷新

在 OpenAI 平台添加独立的"手动输入 Mobile RT"选项，使用
client_id=app_LlGpXReQgckcGGUo2JrYvtJK 刷新 token，与现有
"手动输入 RT"（Codex CLI client_id）互不影响。
共享同一 UI 和批量创建逻辑，通过 clientId 参数区分。
同时修复空名称触发 ent NotEmpty() 校验导致 500 的问题。

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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' | 'session_token' | 'access_token'
+export type AuthInputMethod = 'manual' | 'cookie' | 'refresh_token' | 'mobile_refresh_token' | 'session_token' | 'access_token'
 
 export interface OAuthState {
   authUrl: string

frontend/src/composables/useOpenAIOAuth.ts

@@ -126,9 +126,11 @@ export function useOpenAIOAuth(options?: UseOpenAIOAuthOptions) {
   }
 
   // Validate refresh token and get full token info
+  // clientId: 指定 OAuth client_id（用于第三方渠道获取的 RT，如 app_LlGpXReQgckcGGUo2JrYvtJK）
   const validateRefreshToken = async (
     refreshToken: string,
-    proxyId?: number | null
+    proxyId?: number | null,
+    clientId?: string
   ): Promise<OpenAITokenInfo | null> => {
     if (!refreshToken.trim()) {
       error.value = 'Missing refresh token'
@@ -143,11 +145,12 @@ export function useOpenAIOAuth(options?: UseOpenAIOAuthOptions) {
       const tokenInfo = await adminAPI.accounts.refreshOpenAIToken(
         refreshToken.trim(),
         proxyId,
-        `${endpointPrefix}/refresh-token`
+        `${endpointPrefix}/refresh-token`,
+        clientId
       )
       return tokenInfo as OpenAITokenInfo
     } catch (err: any) {
-      error.value = err.response?.data?.detail || 'Failed to validate refresh token'
+      error.value = err.response?.data?.detail || err.message || 'Failed to validate refresh token'
       appStore.showError(error.value)
       return null
     } finally {