Run background jobs on a pg-boss queue; add e2e tests, CI and deploy script

Timed jobs move from in-process timers to a job registry run by pg-boss:
once per schedule across processes, retries, run history, cron schedules
in the church timezone, and an admin Background jobs page with Run now.
Playwright end-to-end tests run against their own seeded database. A
Gitea Actions workflow runs backend tests, frontend checks and the e2e
tests, and deploys v* tags with scripts/deploy.sh once secrets are set.
Also fixes the at-the-door check-in count for multi-day tickets.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/deploy.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# Updates this install to a tagged release: back up the database, check out the tag,
+# install, migrate, build, and reload PM2. If anything fails before the reload, the
+# previous version keeps running and the checkout goes back to it.
+#
+# Usage (on the server, from the repo folder):  bash scripts/deploy.sh v1.34.0
+# CI runs this over SSH when a v* tag is pushed (see .gitea/workflows/ci.yml).
+set -euo pipefail
+
+TAG="${1:?Usage: scripts/deploy.sh <tag>}"
+cd "$(dirname "$0")/.."
+PREVIOUS="$(git describe --tags --exact-match 2>/dev/null || git rev-parse --short HEAD)"
+
+echo "==> Deploying $TAG (currently $PREVIOUS)"
+
+echo "==> Backing up the database"
+(cd backend && node -e "require('dotenv').config(); require('./src/utils/backupUtils').runBackup().then(r => console.log('   ', r.filename)).catch(e => { console.error('    Backup failed:', e.message); process.exit(1); })")
+
+rollback() {
+  echo "!!> Deploy failed — going back to $PREVIOUS (the running version was not touched)"
+  git checkout -q "$PREVIOUS"
+  (cd backend && npm ci --silent) || true
+  (cd frontend && npm ci --silent && npm run build --silent) || true
+}
+trap rollback ERR
+
+git fetch --tags --quiet origin
+git checkout -q "$TAG"
+
+echo "==> Backend: install and migrate"
+(cd backend && npm ci && npm run prisma:deploy)
+
+echo "==> Frontend: install and build"
+(cd frontend && npm ci && npm run build)
+
+trap - ERR
+echo "==> Reloading PM2"
+pm2 reload ecosystem.config.js --update-env
+
+echo "==> Deployed $TAG"