feat(staff): Restrict staff permissions and add schedule view

- Backend: Restrict staff from accessing resources, customers, services, and tasks APIs
- Frontend: Hide management sidebar links from staff members
- Add StaffSchedule page with vertical timeline view of appointments
- Add StaffHelp page with staff-specific documentation
- Return linked_resource_id and can_edit_schedule in user profile for staff

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/package-lock.json

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