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/components/lessons/store-closure-form.tsx

@@ -0,0 +1,41 @@
+import { useForm } from 'react-hook-form'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+
+interface Props {
+  onSubmit: (data: Record<string, unknown>) => void
+  loading?: boolean
+}
+
+export function StoreClosureForm({ onSubmit, loading }: Props) {
+  const { register, handleSubmit } = useForm({
+    defaultValues: { name: '', startDate: '', endDate: '' },
+  })
+
+  function handleFormSubmit(data: { name: string; startDate: string; endDate: string }) {
+    onSubmit({ name: data.name, startDate: data.startDate, endDate: data.endDate })
+  }
+
+  return (
+    <form onSubmit={handleSubmit(handleFormSubmit)} className="space-y-4">
+      <div className="space-y-2">
+        <Label htmlFor="closure-name">Name *</Label>
+        <Input id="closure-name" {...register('name')} placeholder="e.g. Thanksgiving Break" required />
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="closure-start">Start Date *</Label>
+          <Input id="closure-start" type="date" {...register('startDate')} required />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="closure-end">End Date *</Label>
+          <Input id="closure-end" type="date" {...register('endDate')} required />
+        </div>
+      </div>
+      <Button type="submit" disabled={loading} className="w-full">
+        {loading ? 'Saving...' : 'Add Closure'}
+      </Button>
+    </form>
+  )
+}