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

deploy/deploy.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# LunarFront — Redeploy script (run after pushing changes to main)
+# Usage: sudo bash deploy/deploy.sh
+set -euo pipefail
+
+APP_DIR="/opt/lunarfront"
+APP_USER="ubuntu"
+BUN_BIN="/home/${APP_USER}/.bun/bin/bun"
+
+cd "$APP_DIR"
+
+echo "==> Installing dependencies..."
+sudo -u "$APP_USER" "$BUN_BIN" install --frozen-lockfile
+
+echo "==> Building admin frontend..."
+sudo -u "$APP_USER" bash -c "cd ${APP_DIR}/packages/admin && ${BUN_BIN} run build"
+
+echo "==> Running migrations..."
+sudo -u "$APP_USER" bash -c \
+  "cd ${APP_DIR}/packages/backend && ${BUN_BIN} x drizzle-kit migrate"
+
+echo "==> Restarting backend..."
+systemctl restart lunarfront
+
+echo "==> Done! Checking status..."
+sleep 2
+systemctl status lunarfront --no-pager