new server setup

Dockerfile.backend

@@ -0,0 +1,17 @@
+# ---- Build stage ----
+FROM node:22-alpine AS builder
+WORKDIR /app
+COPY server/package.json server/package-lock.json ./
+RUN npm ci
+COPY server/src ./src
+COPY server/tsconfig.json ./
+RUN npm run build
+
+# ---- Runtime stage ----
+FROM node:22-alpine
+WORKDIR /app
+COPY --from=builder /app/dist ./dist
+COPY server/package.json server/package-lock.json ./
+RUN npm ci --omit=dev
+EXPOSE 3001
+CMD ["node", "dist/index.js"]