CloudFlare-ImgBed v2.6.6

Security:

• Upgraded password hashing to PBKDF2 for stronger security
• Unified auth logic by refactoring backend auth core into authCore with authScope parameter to distinguish admin/user contexts

Fix Bugs:

• Fixed unauthorized popup appearing when redirecting to login page while not logged in
• Fixed duplicate auth error messages when changing password
• Fixed save button sending duplicate requests on click

Security:

• 密码哈希算法升级为 PBKDF2，提升安全强度
• 统一鉴权逻辑，后端认证核心重构为 authCore，支持 authScope 参数区分管理端/用户端

Fix Bugs:

• 修复未登录时跳转登录页弹出认证失败提示的问题
• 修复修改密码时重复弹出认证错误提示的问题
• 修复保存按钮点击后发送两次请求的问题