Replaces the disabled "Coming soon" buttons on the pricing page with a
waitlist band so visitors can be notified when alerts launch — separate
from registered users.
- waitlist_subscribers table (name, email unique, source, referrer)
- WaitlistService::subscribe — normalises email, idempotent
- Public POST /api/waitlist (throttle:10,1), thin controller + form request
- Read-only Filament resource with streamed CSV export
- Vue: useWaitlist composable + WaitlistForm, rendered below the grid
while any tier is still "coming soon"; sends source + document.referrer
Announcement send mechanism deferred to a later task.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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