add Dockerfile for Node.js/TS AI service

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY tsconfig.json ./
+COPY src/ ./src/
+RUN npx tsc
+
+FROM node:20-alpine AS runner
+WORKDIR /app
+RUN apk add --no-cache curl
+COPY --from=builder /app/dist ./dist
+COPY package*.json ./
+RUN npm ci --omit=dev --ignore-scripts
+EXPOSE 5199
+HEALTHCHECK --interval=10s --timeout=5s --start-period=10s --retries=3 \
+  CMD curl --fail http://localhost:5199/health || exit 1
+CMD ["node", "dist/index.js"]