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/Sidebar.tsx

@@ -42,7 +42,8 @@ const Sidebar: React.FC<SidebarProps> = ({ business, user, isCollapsed, toggleCo
   const { canUse } = usePlanFeatures();
 
   const canViewAdminPages = role === 'owner' || role === 'manager';
-  const canViewManagementPages = role === 'owner' || role === 'manager' || role === 'staff';
+  const canViewManagementPages = role === 'owner' || role === 'manager';
+  const isStaff = role === 'staff';
   const canViewSettings = role === 'owner';
   const canViewTickets = role === 'owner' || role === 'manager' || (role === 'staff' && user.can_access_tickets);
 
@@ -110,19 +111,31 @@ const Sidebar: React.FC<SidebarProps> = ({ business, user, isCollapsed, toggleCo
             isCollapsed={isCollapsed}
             exact
           />
-          <SidebarItem
-            to="/scheduler"
-            icon={CalendarDays}
-            label={t('nav.scheduler')}
-            isCollapsed={isCollapsed}
-          />
-          <SidebarItem
-            to="/tasks"
-            icon={Clock}
-            label={t('nav.tasks', 'Tasks')}
-            isCollapsed={isCollapsed}
-            locked={!canUse('plugins') || !canUse('tasks')}
-          />
+          {!isStaff && (
+            <SidebarItem
+              to="/scheduler"
+              icon={CalendarDays}
+              label={t('nav.scheduler')}
+              isCollapsed={isCollapsed}
+            />
+          )}
+          {!isStaff && (
+            <SidebarItem
+              to="/tasks"
+              icon={Clock}
+              label={t('nav.tasks', 'Tasks')}
+              isCollapsed={isCollapsed}
+              locked={!canUse('plugins') || !canUse('tasks')}
+            />
+          )}
+          {isStaff && (
+            <SidebarItem
+              to="/my-schedule"
+              icon={CalendarDays}
+              label={t('nav.mySchedule', 'My Schedule')}
+              isCollapsed={isCollapsed}
+            />
+          )}
           {(role === 'staff' || role === 'resource') && (
             <SidebarItem
               to="/my-availability"