Hub: add POST /api/v1/notify endpoint for customer notifications
- New notification relay endpoint: receives events from customer controllers,
looks up customer email preferences, sends via Resend HTTP API
- New tables: customer_notifications (per-customer email + event prefs),
notification_log (audit trail for all notification attempts)
- Hungarian email template with severity, event type, timestamp
- Config: notifications.resend_api_key + notifications.from_email
- Test events always pass event-type filter
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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