feat(antigravity): 自动设置隐私并支持后台手动重试

新增 Antigravity OAuth 隐私设置能力，在账号创建、刷新、导入和后台
Token 刷新路径自动调用 setUserSettings + fetchUserInfo 关闭遥测；
持久化后同步内存 Extra，错误处理改为日志记录。

Made-with: Cursor

frontend/src/api/admin/accounts.ts

@@ -627,6 +627,16 @@ export async function batchRefresh(accountIds: number[]): Promise<BatchOperation
   return data
 }
 
+/**
+ * Set privacy for an Antigravity OAuth account
+ * @param id - Account ID
+ * @returns Updated account
+ */
+export async function setPrivacy(id: number): Promise<Account> {
+  const { data } = await apiClient.post<Account>(`/admin/accounts/${id}/set-privacy`)
+  return data
+}
+
 export const accountsAPI = {
   list,
   listWithEtag,
@@ -663,7 +673,8 @@ export const accountsAPI = {
   importData,
   getAntigravityDefaultModelMapping,
   batchClearError,
-  batchRefresh
+  batchRefresh,
+  setPrivacy
 }
 
 export default accountsAPI