fix: 修复proxy_service和account_service中不当的顶层import

- proxy_service.py: 将requests和WhitelistManager改为函数内延迟import，
  避免启动时加载不需要的依赖；移除未使用的get_exit_ip_via_proxy导入
- account_service.py: 移除未使用的func、joinedload、AuditLog、
  user_has_permission顶层导入

web/frontend/src/api/login.ts

@@ -0,0 +1,12 @@
+import api from './client';
+import type { BatchLoginResult, LoginTaskItem, MessageDeletedResponse, MessageResponse } from './types';
+
+export const loginApi = {
+  createBatch: (account_ids: number[], max_geetest_retries?: number, concurrency?: number, max_proxy_retries?: number) =>
+    api.post<BatchLoginResult, BatchLoginResult>('/login/batch', { account_ids, max_geetest_retries, concurrency, max_proxy_retries }),
+  listTasks: (batch_id?: string) =>
+    api.get<LoginTaskItem[], LoginTaskItem[]>('/login/tasks', { params: batch_id ? { batch_id } : {} }),
+  stop: (batch_id: string) => api.post<MessageResponse, MessageResponse>(`/login/stop/${batch_id}`),
+  deleteTask: (id: number) => api.delete<MessageResponse, MessageResponse>(`/login/tasks/${id}`),
+  deleteTasks: (ids: number[]) => api.delete<MessageDeletedResponse, MessageDeletedResponse>(`/login/tasks`, { params: { task_ids: ids.join(',') } }),
+};