The store's can()/useCan() helpers existed but were unused. Now:
- src/auth/permissions.ts PERM catalog mirrors backend keys
- every nav item carries a permission; sidebar filter reuses can()
- requirePermission() beforeLoad guard on all child routes (direct URLs
redirect home when the session lacks the key)
- useCan() hides/disables mutation buttons: moderation actions,
retranslate, robot-author edit/pause, category + locale CRUD, and the
reserved-SID assign path (admin:sid:override hint)
- 403 responses toast 无权限执行此操作; can() unit tests added
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>