chore: import upstream snapshot with attribution

examples/integrations/langgraph-js/Dockerfile

@@ -0,0 +1,45 @@
+# Stage 1: Build Next.js frontend
+FROM node:22-slim AS frontend
+
+WORKDIR /app
+
+COPY package.json ./
+RUN npm install --ignore-scripts
+
+COPY src/ ./src/
+COPY public/ ./public/
+COPY next.config.ts tsconfig.json postcss.config.mjs ./
+COPY showcase.json ./showcase.json
+
+# Docker override: use AG-UI HttpAgent instead of LangGraphAgent.
+# Next.js 16+ rejects both /api/copilotkit/route.ts AND /api/copilotkit/[[...slug]]/route.ts
+# at the same time — remove the default catch-all and drop in the HttpAgent route.
+RUN rm -f ./src/app/api/copilotkit/\[\[...slug\]\]/route.ts
+COPY docker-route-override.ts ./src/app/api/copilotkit/route.ts
+RUN npm install @ag-ui/client
+
+ENV NODE_OPTIONS="--max-old-space-size=4096"
+# Next.js 16+ uses Turbopack by default; use --webpack for serverExternalPackages compat
+RUN npx next build --webpack
+
+# Stage 2: Production image (Node only)
+FROM node:22-slim AS runner
+
+WORKDIR /app
+
+# Copy agent source and install its deps
+COPY agent/ ./agent/
+RUN cd agent && npm install --ignore-scripts
+
+# Copy Next.js standalone build
+COPY --from=frontend /app/.next/standalone ./
+COPY --from=frontend /app/.next/static ./.next/static
+COPY --from=frontend /app/public ./public
+
+COPY entrypoint.sh ./
+RUN chmod +x entrypoint.sh
+
+EXPOSE 3000
+ENV NODE_ENV=production
+
+CMD ["./entrypoint.sh"]