feat: 完善岗位管理前端页面

[aruis]

Summary

• add the static position management page using position category as the business entry
• extract reusable record explorer panel/list/status switch components for tree/list + detail layouts
• improve platform UI wrappers for icon buttons, tree row actions, animated search, and switch controls
• wire mock data, business route registration, and position management state tests

Validation

• npm run check --prefix muyun-web