feat: add email notification system (Brevo SMTP + N8N daily digest)

- Add core notification service: types, email-service (nodemailer/Brevo SMTP), notification-service (digest builder, preference CRUD, HTML renderer)
- Add API routes: POST /api/notifications/digest (N8N cron, Bearer auth), GET/PUT /api/notifications/preferences (session auth)
- Add NotificationPreferences UI component (Bell button + dialog with per-type toggles) in Registratura toolbar
- Add 7 Brevo SMTP env vars to docker-compose.yml
- Update CLAUDE.md, ROADMAP.md, DATA-MODEL.md, SYSTEM-ARCHITECTURE.md, CONFIGURATION.md, DOCKER-DEPLOYMENT.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -46,6 +46,14 @@ services:
       - ETERRA_PASSWORD=${ETERRA_PASSWORD:-}
       # DWG-to-DXF sidecar
       - DWG2DXF_URL=http://dwg2dxf:5001
+      # Email notifications (Brevo SMTP)
+      - BREVO_SMTP_HOST=smtp-relay.brevo.com
+      - BREVO_SMTP_PORT=587
+      - BREVO_SMTP_USER=${BREVO_SMTP_USER:-}
+      - BREVO_SMTP_PASS=${BREVO_SMTP_PASS:-}
+      - NOTIFICATION_FROM_EMAIL=noreply@beletage.ro
+      - NOTIFICATION_FROM_NAME=ArchiTools
+      - NOTIFICATION_CRON_SECRET=${NOTIFICATION_CRON_SECRET:-}
     depends_on:
       dwg2dxf:
         condition: service_healthy