Initial commit: YesChef family shopping list and recipe app

Backend (.NET 10 minimal API):
- Vertical slice architecture with feature folders
- Postgres via EF Core with initial migration
- JWT auth with family invite code registration
- REST endpoints for stores, shopping lists, items, recipes
- SignalR hub for real-time list collaboration (per-list groups
  and lists-overview group for live list creation/archival/progress)
- Multi-stage Dockerfile

Frontend (SvelteKit + Svelte 5 runes, Tailwind v4):
- Mobile-first PWA with web manifest and service worker
- Bottom-nav layout, login/register, lists overview, list detail,
  stores management, recipes (list/create/detail with add-to-list)
- SignalR client with reference-counted connection
- Real-time updates on both lists overview and list detail pages

Infrastructure:
- docker-compose.yml with postgres, backend, frontend services
  and Traefik labels for path-based routing (/api, /hubs to backend)
- .env.example with required config

End-to-end tests (Playwright):
- test-e2e.mjs: single-user flow (auth, stores, lists, items, recipes)
- test-e2e-multiuser.mjs: two-user real-time sync coverage

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/frontend/Dockerfile

@@ -0,0 +1,15 @@
+FROM node:22-slim AS build
+WORKDIR /app
+COPY package*.json .
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM node:22-slim
+WORKDIR /app
+COPY --from=build /app/build .
+COPY --from=build /app/package.json .
+RUN npm ci --omit=dev
+EXPOSE 3000
+ENV PORT=3000
+CMD ["node", "index.js"]