Summary

Add a scalable notification and reminder system to help users proactively manage personal finances.

Changes

• Add an in-app notification inbox with filtering, pagination, unread counts, and read/delete actions.
• Add user notification preferences for in-app, email, Zalo, and push channels.
• Add one-time and recurring reminders with daily, weekly, monthly, and yearly schedules.
• Add a database-backed delivery outbox with idempotency and retry support.
• Add background processing for:
  • Budget threshold and exceeded alerts.
  • Saving goal progress, completion, and deadline alerts.
  • Recurring payment and custom reminders.
  • Unusual expense detection based on recent transaction history.
• Integrate email delivery using the existing SMTP configuration.
• Add extensible placeholders for Zalo and push notification providers.
• Add Prisma models, enums, indexes, constraints, and a safe migration.
• Update Swagger documentation and project memory.
• Add worker configuration through NOTIFICATION_* environment variables.