Replace AssetMapper + Stimulus + Turbo with Vue 3 SPA (Vite,
TypeScript strict, SCSS modules, Konva.js). Authenticated app is
now a full SPA served by Symfony catch-all; public flows (provisioning,
email approve/decline) remain Symfony + Twig. Add JSON API controllers
for SPA, SpaController catch-all, updated directory structure, and
revised implementation sequence.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>