fix(account): 重新授权不再清空 Extra 配置

Claude / OpenAI 账号重新授权走通用 PUT /accounts/:id 时，后端
UpdateAccount 会全量覆盖 account.Extra（仅保留 5 个 quota 用量键），
导致 base_rpm / window_cost_limit / window_cost_sticky_reserve /
max_sessions / quota_* / privacy_mode 等持久化配置全部丢失。

新增专用接口 POST /accounts/:id/apply-oauth-credentials，沿用
现有 /refresh 路径模式：Credentials-only update + Extra JSONB
key 级合并（UpdateAccountExtra） + ClearError + InvalidateToken。

作用域：Claude OAuth / Claude Cookie auth / OpenAI OAuth 三个
调用点。Gemini / Antigravity 现有路径本就不传 extra，保持不变。

顺带修复：旧重新授权路径未调用 InvalidateToken，导致重新授权后
首请求可能仍用缓存中的旧 token 而立即 401。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/admin/account/ReAuthAccountModal.vue

@@ -371,16 +371,12 @@ const handleExchangeCode = async () => {
     const extra = oauthClient.buildExtraInfo(tokenInfo)
 
     try {
-      // Update account with new credentials
-      await adminAPI.accounts.update(props.account.id, {
-        type: 'oauth', // OpenAI OAuth is always 'oauth' type
+      const updatedAccount = await adminAPI.accounts.applyOAuthCredentials(props.account.id, {
+        type: 'oauth',
         credentials,
         extra
       })
 
-      // Clear error status after successful re-authorization
-      const updatedAccount = await adminAPI.accounts.clearError(props.account.id)
-
       appStore.showSuccess(t('admin.accounts.reAuthorizedSuccess'))
       emit('reauthorized', updatedAccount)
       handleClose()
@@ -476,16 +472,12 @@ const handleExchangeCode = async () => {
 
       const extra = claudeOAuth.buildExtraInfo(tokenInfo)
 
-      // Update account with new credentials and type
-      await adminAPI.accounts.update(props.account.id, {
-        type: addMethod.value, // Update type based on selected method
-        credentials: tokenInfo,
+      const updatedAccount = await adminAPI.accounts.applyOAuthCredentials(props.account.id, {
+        type: addMethod.value as 'oauth' | 'setup-token',
+        credentials: tokenInfo as unknown as Record<string, unknown>,
         extra
       })
 
-      // Clear error status after successful re-authorization
-      const updatedAccount = await adminAPI.accounts.clearError(props.account.id)
-
       appStore.showSuccess(t('admin.accounts.reAuthorizedSuccess'))
       emit('reauthorized', updatedAccount)
       handleClose()
@@ -519,16 +511,12 @@ const handleCookieAuth = async (sessionKey: string) => {
 
     const extra = claudeOAuth.buildExtraInfo(tokenInfo)
 
-    // Update account with new credentials and type
-    await adminAPI.accounts.update(props.account.id, {
-      type: addMethod.value, // Update type based on selected method
-      credentials: tokenInfo,
+    const updatedAccount = await adminAPI.accounts.applyOAuthCredentials(props.account.id, {
+      type: addMethod.value as 'oauth' | 'setup-token',
+      credentials: tokenInfo as unknown as Record<string, unknown>,
       extra
     })
 
-    // Clear error status after successful re-authorization
-    const updatedAccount = await adminAPI.accounts.clearError(props.account.id)
-
     appStore.showSuccess(t('admin.accounts.reAuthorizedSuccess'))
     emit('reauthorized', updatedAccount)
     handleClose()