fix(captcha): wire scene switches and rename menu to 人机验证

- Admin: 登录权限 → 人机验证; 停用场景 → 启用场景 (opt-in)
- Normalize enabled_scenarios with legacy disabled_scenarios BC
- Sign-in: never soft-bypass captcha; cancel unlocks button
- Captcha JS: cancel path finishes pending callback as false

assets/admin/src/constants/sections/permissions.js

@@ -42,10 +42,10 @@ export const permissionsSection = {
     schemaPage({
       key: 'permissions-login',
       name: 'PermissionsLogin',
-      label: '登录权限',
+      label: '人机验证',
       route: '/permissions/login',
-      title: '登录权限',
-      desc: '登录验证、人机验证、注册限制配置。',
+      title: '人机验证',
+      desc: '云验证码服务商、场景开关与密钥配置。',
       canonicalDomain: 'permissions',
       section: 'login',
     }),