When a new user registers, all super_admin users receive:
- A database notification shown in the bell (type: new_user), with the
new user's avatar and a link to their channel
- An email congratulating them with the new member's name, email,
join date, gender, and nationality, plus a View Profile CTA
Notification rendering in app.blade.php refactored into notifHref() and
notifThumb() helpers so new_user notifications link to /channel/{slug}
and show a circular avatar instead of a video thumbnail. Also fixed the
legacy /storage/thumbnails/ path to /media/thumbnails/ for video notifications.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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