Add Dockerfile and build automation

Dockerfile

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+FROM node:25-slim AS builder
+
+WORKDIR /app
+
+COPY .npmrc ./
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+
+RUN npm run build
+
+
+FROM node:25-slim AS runner
+
+ENV NODE_ENV=production
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY --from=builder /app/dist ./dist
+
+USER node
+
+CMD ["node", "dist/index.js"]