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/src/components/Schedule/DraggableEvent.tsx

@@ -4,7 +4,9 @@ import { CSS } from '@dnd-kit/utilities';
 import { clsx } from 'clsx';
 import { Clock, DollarSign } from 'lucide-react';
 
-export type AppointmentStatus = 'PENDING' | 'CONFIRMED' | 'COMPLETED' | 'CANCELLED' | 'NO_SHOW';
+// Import from types.ts for consistency
+import type { AppointmentStatus } from '../../types';
+export type { AppointmentStatus };
 
 export interface DraggableEventProps {
     id: number;