feat(backend added)

backend/Dockerfile

@@ -0,0 +1,23 @@
+# syntax=docker/dockerfile:1
+
+# Stage 1: Build frontend
+FROM node:20-alpine AS frontend-builder
+WORKDIR /app/frontend
+COPY crmDashboard/package*.json ./
+RUN npm install
+COPY crmDashboard/ ./
+RUN npm run build
+
+# Stage 2: Bun backend
+FROM oven/bun:1-alpine
+WORKDIR /app
+
+COPY backend/package.json backend/bun.lockb* ./
+RUN bun install --production
+
+COPY backend/ ./
+COPY --from=frontend-builder /app/frontend/dist ./public
+
+EXPOSE 3000
+
+CMD ["bun", "run", "server.js"]