# 01 — Architecture Overview

- Backend: Laravel 12 (PHP 8.3), API-first.
- Super Admin: Filament 4 web panel (platform operations only).
- Tenant Admin: Separate React/Vite PWA, store-ready (Android TWA, iOS Capacitor). See ADR-0006.
- Guest PWA: React/Vite, anonymous session for attendees.
- Storage: S3-compatible object storage, signed URLs, CDN in front.
- Queues: Redis + Horizon for media processing and async jobs.
- DB: Single database, row-level multi-tenancy using `tenant_id` and policies.

Components
- API (`/api/v1`) with Sanctum personal access tokens for tenant apps; session auth for Super Admin.
- Media pipeline: upload -> scan -> transform (EXIF/orientation/sizes) -> store -> CDN.
- Notifications: Web Push (VAPID); Capacitor push for iOS wrapper when needed.
- Observability: request ID, structured logs, audit trails for admin actions.