feat: reminders, Excel customer import and security hardening

Features
- Payment reminders via Resend (candidates, send, history, test email)
- Bulk import of the customer list from Excel/CSV in the dashboard
- Dashboard i18n (en/nl) with language selector

Security
- Enforce venue isolation on all /venues/:venueId routes
- Require admin for planned-tab changes and pairing codes
- Rate-limit login and device registration; opt-in TRUST_PROXY
- Require JWT_SECRET in production; stop leaking internal errors
- Escape customer names in reminder emails

Sync and commands
- Remove tabs the terminal no longer reports; validate nested sync payload
- Return all pending commands on every sync (fixes missed-command race)
- First command ack wins; atomic registration code claim
- Reject commands for revoked devices, stale versions or duplicates
- Remind only unpaid balances, with a 7-day cooldown

Dashboard
- Share a single token refresh across concurrent 401s (random logouts)
- Keep the session alive for the refresh token lifetime

Deployment
- Replace `db push --accept-data-loss` with migrations (baselines legacy DBs)
- Set NODE_ENV=production; pass Resend and TRUST_PROXY env in prod compose

Dockerfile

@@ -37,8 +37,9 @@ COPY --from=builder /app/packages/shared/package.json ./packages/shared/
 COPY --from=builder /app/packages/shared/dist ./packages/shared/dist/
 RUN pnpm install --prod
 
+ENV NODE_ENV=production
 EXPOSE 3001
-CMD ["sh", "-c", "npx prisma db push --accept-data-loss && node dist/main.js"]
+CMD ["sh", "-c", "node prisma/deploy.js && node dist/main.js"]
 
 # ---- Production Dashboard image ----
 FROM node:20-alpine AS dashboard