add Dockerfiles and docker-compose for Coolify deploy

backend/Dockerfile

@@ -0,0 +1,16 @@
+FROM node:22-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --ignore-scripts
+COPY . .
+RUN npx prisma generate
+RUN npm run build
+
+FROM node:22-alpine AS runner
+WORKDIR /app
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/package.json ./
+COPY --from=builder /app/prisma ./prisma
+EXPOSE 3000
+CMD ["node", "dist/main.js"]