Configure board deployment and backend proxy

server/Dockerfile

@@ -0,0 +1,13 @@
+FROM node:22-alpine
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev && npm cache clean --force
+COPY realtime-server.mjs ./
+
+USER node
+EXPOSE 8787
+HEALTHCHECK --interval=15s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget -qO- http://127.0.0.1:8787/healthz | grep -q '"status":"ok"'
+
+CMD ["node", "realtime-server.mjs"]