feat(api): 添加或删除 passkey、修改邮箱前须 5 分钟内用已有因子重新验证，变更后邮件通知账户，面板加确认对话框与修改邮箱入口

panel/src/i18n/resources/en-US/errors.json

@@ -78,6 +78,9 @@
   "passkey_login_failed": "Passkey verification failed — try again.",
   "passkey_login_invalid": "That Passkey sign-in request is invalid or expired — start it again.",
   "too_many_challenges": "Too many verification attempts right now — try again shortly.",
+  "reauth_required": "Confirm it's you first: this change needs your Passkey or an email code from the last few minutes.",
+  "staff_reauth": "Operator accounts confirm with a Passkey or by signing in again.",
+  "no_session": "This only works in a browser signed in to Felis.",
   "op_login_invalid": "This operator sign-in couldn't be completed — restart the sign-in.",
   "op_login_not_found": "No pending operator sign-in with that id.",
   "too_many_streams": "Too many live streams are open — close some pages and try again.",