feat: add Docker configuration for deployment

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --only=production
+
+COPY src/ ./src/
+COPY data/ ./data/
+COPY ui/ ./ui/
+COPY .env.example ./
+
+EXPOSE 3000
+
+ENV NODE_ENV=production
+ENV PORT=3000
+
+CMD ["node", "src/index.js"]