Add lessons module, rate cycles, EC2 deploy scripts, and help content

- Lessons module: lesson types, instructors, schedule slots, enrollments,
  sessions (list + week grid view), lesson plans, grading scales, templates
- Rate cycles: replace monthly_rate with billing_interval + billing_unit on
  enrollments; add weekly/monthly/quarterly rate presets to lesson types and
  schedule slots with auto-fill on enrollment form
- Member detail page: tabbed layout for details, identity documents, enrollments
- Sessions week view: custom 7-column grid replacing react-big-calendar
- Music store seed: instructors, lesson types, slots, enrollments, sessions,
  grading scale, lesson plan template
- Scrollbar styling: themed to match sidebar/app palette
- deploy/: EC2 setup and redeploy scripts, nginx config, systemd service
- Help: add Lessons category (overview, types, instructors, slots, enrollments,
  sessions, plans/grading); collapsible sidebar with independent scroll;
  remove POS/accounting references from docs

packages/admin/src/routes/_authenticated/accounts/$accountId/enrollments.tsx

@@ -0,0 +1,67 @@
+import { createFileRoute, useNavigate } from '@tanstack/react-router'
+import { useQuery } from '@tanstack/react-query'
+import { enrollmentListOptions } from '@/api/lessons'
+import { memberListOptions } from '@/api/members'
+import { DataTable, type Column } from '@/components/shared/data-table'
+import { Button } from '@/components/ui/button'
+import { Badge } from '@/components/ui/badge'
+import { Plus } from 'lucide-react'
+import { useAuthStore } from '@/stores/auth.store'
+import type { Enrollment } from '@/types/lesson'
+
+export const Route = createFileRoute('/_authenticated/accounts/$accountId/enrollments')({
+  component: AccountEnrollmentsTab,
+})
+
+function statusBadge(status: string) {
+  const variants: Record<string, 'default' | 'secondary' | 'destructive' | 'outline'> = {
+    active: 'default', paused: 'secondary', cancelled: 'destructive', completed: 'outline',
+  }
+  return <Badge variant={variants[status] ?? 'outline'}>{status}</Badge>
+}
+
+const columns: Column<Enrollment & { memberName?: string }>[] = [
+  { key: 'member_name', header: 'Member', sortable: true, render: (e) => <span className="font-medium">{(e as any).memberName ?? e.memberId}</span> },
+  { key: 'status', header: 'Status', sortable: true, render: (e) => statusBadge(e.status) },
+  { key: 'start_date', header: 'Start', sortable: true, render: (e) => <>{new Date(e.startDate + 'T00:00:00').toLocaleDateString()}</> },
+  { key: 'rate', header: 'Rate', render: (e) => <>{e.rate ? `$${e.rate}${e.billingInterval ? ` / ${e.billingInterval} ${e.billingUnit}` : ''}` : <span className="text-muted-foreground">—</span>}</> },
+]
+
+function AccountEnrollmentsTab() {
+  const { accountId } = Route.useParams()
+  const navigate = useNavigate()
+  const hasPermission = useAuthStore((s) => s.hasPermission)
+
+  // Get member IDs for this account so we can filter enrollments
+  const { data: membersData } = useQuery(memberListOptions(accountId, { page: 1, limit: 100, order: 'asc' }))
+  const memberIds = (membersData?.data ?? []).map((m) => m.id)
+
+  const { data, isLoading } = useQuery({
+    ...enrollmentListOptions({ accountId, page: 1, limit: 100 }),
+    enabled: !!accountId,
+  })
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-between">
+        <p className="text-sm text-muted-foreground">{data?.pagination.total ?? 0} enrollment(s)</p>
+        {hasPermission('lessons.edit') && (
+          <Button size="sm" onClick={() => navigate({ to: '/lessons/enrollments/new', search: {} as any })}>
+            <Plus className="h-4 w-4 mr-1" />Enroll a Member
+          </Button>
+        )}
+      </div>
+      <DataTable
+        columns={columns}
+        data={data?.data ?? []}
+        loading={isLoading}
+        page={1}
+        totalPages={1}
+        total={data?.data?.length ?? 0}
+        onPageChange={() => {}}
+        onSort={() => {}}
+        onRowClick={(e) => navigate({ to: '/lessons/enrollments/$enrollmentId', params: { enrollmentId: e.id }, search: {} as any })}
+      />
+    </div>
+  )
+}