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.

Documentation/CURRENT_BACKEND_STATUS.md

@@ -1,5 +1,13 @@
 # ZUMRI Current Backend Status
 
+## Phase 2 Completion Update
+
+Completion date: 2026-09-03. Phase 2 hardens the existing shared-service foundation without adding commerce domains. Module 14 (notifications) is now approximately 72%; Module 19 (file/media) 82%; Module 20 (audit/config/logging) 68%; and Module 21 (background jobs) 78%. The document subsystem is approximately 82%.
+
+Storage now has a reusable S3/S3-compatible boundary, actual-content validation, controlled keys, checksums, owner/status metadata, compensation, and authorization-safe signed URLs. Email is routed through BullMQ with delivery status and final-failure persistence. Notifications have fixed aliases, unique assignment migration, self-only inbox/read operations, announcement support, and preference policy. Queue defaults, idempotent job IDs, Bull Board registration, safe failure handling, stronger append-only activity records, and structured redacted logs are in place. Documents now have ownership, controlled registry validation, persisted generation lifecycle, safe status, and non-destructive signed download.
+
+The full mocked suite contains 10 suites/40 tests and passes; syntax checks cover 153 JavaScript files. The new migration was not executed. Remaining work is staging migration/data pre-checks plus real MySQL, Redis, S3-compatible, SMTP, PDF/browser, retention-volume, and concurrency validation. After those operational checks and permission seeding, it is safe to begin Phase 3. See `Documentation/PHASE_2_CROSS_CUTTING_SERVICES.md` and `Documentation/API_CROSS_CUTTING_SERVICES.md`.
+
 Audit date: 2026-09-03  
 Scope: repository source, configuration, lockfile, existing documentation, safe syntax/test/dependency checks. No database, Redis, S3, email, or other external service was mutated.