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/lessons/plans/index.tsx

@@ -0,0 +1,91 @@
+import { useState } from 'react'
+import { createFileRoute, useNavigate } from '@tanstack/react-router'
+import { useQuery } from '@tanstack/react-query'
+import { lessonPlanListOptions } from '@/api/lessons'
+import { usePagination } from '@/hooks/use-pagination'
+import { DataTable, type Column } from '@/components/shared/data-table'
+import { Button } from '@/components/ui/button'
+import { Badge } from '@/components/ui/badge'
+import { Input } from '@/components/ui/input'
+import { Search } from 'lucide-react'
+import type { LessonPlan } from '@/types/lesson'
+
+export const Route = createFileRoute('/_authenticated/lessons/plans/')({
+  validateSearch: (search: Record<string, unknown>) => ({
+    page: Number(search.page) || 1,
+    limit: Number(search.limit) || 25,
+    q: (search.q as string) || undefined,
+    sort: (search.sort as string) || undefined,
+    order: (search.order as 'asc' | 'desc') || 'desc',
+  }),
+  component: LessonPlansPage,
+})
+
+const columns: Column<LessonPlan>[] = [
+  { key: 'title', header: 'Title', sortable: true, render: (p) => <span className="font-medium">{p.title}</span> },
+  {
+    key: 'progress', header: 'Progress', sortable: true,
+    render: (p) => (
+      <div className="flex items-center gap-2">
+        <div className="w-24 bg-muted rounded-full h-2">
+          <div className="bg-primary h-2 rounded-full" style={{ width: `${p.progress}%` }} />
+        </div>
+        <span className="text-xs text-muted-foreground">{Math.round(p.progress)}%</span>
+      </div>
+    ),
+  },
+  {
+    key: 'is_active', header: 'Status',
+    render: (p) => <Badge variant={p.isActive ? 'default' : 'secondary'}>{p.isActive ? 'Active' : 'Inactive'}</Badge>,
+  },
+  {
+    key: 'created_at', header: 'Created', sortable: true,
+    render: (p) => <>{new Date(p.createdAt).toLocaleDateString()}</>,
+  },
+]
+
+function LessonPlansPage() {
+  const navigate = useNavigate()
+  const { params, setPage, setSearch, setSort } = usePagination()
+  const [searchInput, setSearchInput] = useState(params.q ?? '')
+
+  const { data, isLoading } = useQuery(lessonPlanListOptions(params))
+
+  function handleSearchSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    setSearch(searchInput)
+  }
+
+  return (
+    <div className="space-y-6">
+      <h1 className="text-2xl font-bold">Lesson Plans</h1>
+
+      <form onSubmit={handleSearchSubmit} className="flex gap-2 max-w-sm">
+        <div className="relative flex-1">
+          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
+          <Input
+            placeholder="Search lesson plans..."
+            value={searchInput}
+            onChange={(e) => setSearchInput(e.target.value)}
+            className="pl-9"
+          />
+        </div>
+        <Button type="submit" variant="secondary">Search</Button>
+      </form>
+
+      <DataTable
+        columns={columns}
+        data={data?.data ?? []}
+        loading={isLoading}
+        page={params.page}
+        totalPages={data?.pagination.totalPages ?? 1}
+        total={data?.pagination.total ?? 0}
+        sort={params.sort}
+        order={params.order}
+        onPageChange={setPage}
+        onSort={setSort}
+        onRowClick={(p) => navigate({ to: '/lessons/plans/$planId', params: { planId: p.id }, search: {} as any })}
+      />
+    </div>
+  )
+}