Research API-first approach with Spring Boot (openapi-generator-maven-plugin)
and Vue 3 frontend (openapi-typescript + openapi-fetch). Add T-5 setup task
for scaffolding the tooling. Update T-4 to depend on T-5 (removes redundant
API client AC), update implementation phases table and mermaid dependency graph.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
