fix: 修复日期格式转换问题

feat: 优化日期显示格式

feat: 添加支付记录和最近登录字段，优化日期显示

feat: show full timestamps in admin user list

style: remove parenthetical text from order status in admin panel

feat: enhance admin order management with status toggling and fullscreen modal

feat: implement user order history in admin panel

feat: implement user deletion in admin panel

style: stack UID below username and fit columns to content

style: deep UI tuning for AdminPanel layout and interactions

style: simplify AdminPanel UI with pure Chinese and compact layout

style: refine AdminPanel UI and logic based on feedback

feat: implement super-admin account and management dashboard