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/cookies.ts

@@ -0,0 +1,8 @@
+import api from './client';
+import type { CookieItem, MessageResponse } from './types';
+
+export const cookieApi = {
+  list: () => api.get<CookieItem[], CookieItem[]>('/cookies'),
+  exportCsv: (format?: string) => api.get<Blob, Blob>('/cookies/export', { responseType: 'blob', params: format ? { format } : {} }),
+  delete: (id: number) => api.delete<MessageResponse, MessageResponse>(`/cookies/${id}`),
+};