scaffold: modern rewrite skeleton (backend + frontend PWA) + roadmap

modern/README.md

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+# LifeRPG Modern Scaffold
+
+This folder contains a small scaffold to kick off the modernization of LifeRPG.
+
+What is included:
+- `backend/` - minimal stdlib-based JSON HTTP server (dev-only)
+- `frontend/` - minimal React + Vite scaffold and PWA files
+- `ROADMAP.md` - prioritized milestones and estimates
+- Dockerfile and docker-compose for local development
+
+Next steps:
+- Replace backend with FastAPI and add DB/ORM/migrations
+- Implement OAuth2 and integrations adapters
+- Expand frontend with components and theming
+