feat: complete saleor core extensions app with React email templates

- Order confirmation, shipped, and cancelled email templates
- Uses @react-email/components for professional HTML emails
- Sends admin and customer notifications
- Integrates with Resend for email delivery
- Webhook handlers for ORDER_CREATED, ORDER_FULFILLED, ORDER_CANCELLED
- Docker image optimized for production
- Persistent auth data storage via PVC

Dockerfile

@@ -0,0 +1,30 @@
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+ENV NEXT_TELEMETRY_DISABLED=1
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+RUN npm run generate && npm run build
+
+FROM node:22-alpine
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs && adduser --system --uid 1001 nextjs
+
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
+EXPOSE 3000
+
+CMD ["node", "server.js"]