feat: Implement Phase 2 cross-cutting services with email and notification enhancements

- Refactor email verification and password reset utilities to use new email service.
- Introduce email delivery queue and notification delivery model for better tracking.
- Enhance file validation and storage services for improved security and ownership management.
- Add cron job for cleaning inactive notifications with retention policy.
- Update document worker to handle document generation and storage more efficiently.
- Implement logging improvements in activity and log workers.
- Create comprehensive documentation for new API endpoints and services.
- Add unit tests for file validation and notification policies to ensure robustness.

app/workers/activity.worker.js

@@ -19,7 +19,8 @@ const createActivityWorker = () => {
   const worker = new Worker(
     "activity-queue",
     async (job) => {
-      await UserActivity.create(job.data);
+      try { await UserActivity.create(job.data); }
+      catch (error) { if (error.name === "SequelizeUniqueConstraintError" && job.data.event_id) return { duplicate: true }; throw error; }
     },
     {
       connection,