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/members/index.tsx

@@ -84,7 +84,7 @@ function MembersListPage() {
             </Button>
           </DropdownMenuTrigger>
           <DropdownMenuContent align="end">
-            <DropdownMenuItem onClick={() => navigate({ to: '/members/$memberId', params: { memberId: row.id } })}>
+            <DropdownMenuItem onClick={() => navigate({ to: '/members/$memberId', params: { memberId: row.id }, search: {} as any })}>
               <Pencil className="mr-2 h-4 w-4" />
               Edit
             </DropdownMenuItem>
@@ -134,7 +134,7 @@ function MembersListPage() {
         order={params.order}
         onPageChange={setPage}
         onSort={setSort}
-        onRowClick={(member) => navigate({ to: '/members/$memberId', params: { memberId: member.id } })}
+        onRowClick={(member) => navigate({ to: '/members/$memberId', params: { memberId: member.id }, search: {} as any })}
       />
     </div>
   )