- Add comprehensive project overview and core philosophy
- Document file structure reference for the codebase
- Create key files reference table for task-specific guidance
- Include multi-tenant guidelines and site resolution flow
- Run database migrations on startup if `RUN_MIGRATIONS=true`
- Block public access to deactivated sites with a 503 page, allowing admin/login paths
- Add `isSuperAdmin` boolean to session user type in app.d.ts