PlexBI — Next.js front-end

Strangler-fig FE-first rebuild. F0 foundations + F1 interactive dashboard (read path) are in place.

• Public dashboard: /dashboard/<random_code>
• Developer dashboard: /dashboard/<report_id> (developer route group)

Set LEGACY_ORIGIN in .env.local to your running Laravel app; API calls proxy there until the gateway/NestJS is in place.