feat: extract shop from mp/shop — initial libreshop/shop

Source moved verbatim from mp/shop/ on 2026-04-29; mp was the first
concrete adapter consuming the libreshop toolkit. Builds and publishes
git.librete.ch/libreshop/shop on every main / v* push via the standard
.gitea/workflows/build.yml shared across libreshop components.

Dockerfile

@@ -0,0 +1,39 @@
+# Builder stage (use debian-based image for native binding compatibility)
+FROM node:22-slim AS builder
+
+WORKDIR /app
+
+# Copy package files and install dependencies
+COPY package.json package-lock.json ./
+RUN npm ci --no-audit --no-fund
+
+# Copy source code
+COPY . .
+
+# Build the application
+# No build args needed - Nuxt runtimeConfig is overridden at runtime via NUXT_* env vars
+RUN npm run build
+
+# Development stage
+FROM builder AS dev
+
+EXPOSE 9999
+
+CMD ["npm", "run", "dev"]
+
+# Production stage (can use slim image since we only need node runtime)
+FROM node:22-slim AS prod
+
+WORKDIR /app
+
+# Copy built application from builder
+COPY --from=builder /app/.output /app/.output
+
+# Runtime defaults (overridden by docker-compose environment)
+ENV NODE_ENV=production \
+    HOST=0.0.0.0 \
+    PORT=9999
+
+EXPOSE 9999
+
+CMD ["node", ".output/server/index.mjs"]