chore: import upstream snapshot with attribution

examples/integrations/langgraph-python/Dockerfile

@@ -0,0 +1,76 @@
+# Stage 1: Build Next.js frontend
+FROM node:20-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
+# (LangGraphAgent needs Docker-in-Docker which Railway doesn't provide)
+# Next.js 16+ rejects both /api/copilotkit/route.ts AND /api/copilotkit/[[...slug]]/route.ts
+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 with Python + Node
+FROM python:3.12.10-slim AS runner
+
+# Install Node.js 20 + uv
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl ca-certificates && \
+    curl -fsSL https://deb.nodesource.com/setup_20.x | bash - && \
+    apt-get install -y --no-install-recommends nodejs && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# Install uv by copying from the official image (avoids curl|sh pipe-swallow bug
+# where a 5xx on astral.sh silently produces an exit-0 layer with no uv binary).
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /usr/local/bin/
+
+ENV PATH="/root/.local/bin:$PATH"
+
+WORKDIR /app
+
+# Install Python deps — EXCLUDING langgraph-cli and langgraph-api
+# (they need Docker-in-Docker which Railway doesn't provide)
+# Instead serve via ag-ui-langgraph + copilotkit (same protocol, no Docker needed)
+COPY agent/ ./agent/
+# Install ag-ui-langgraph FIRST at pinned version (before copilotkit can override it)
+RUN uv pip install --system "ag-ui-langgraph[fastapi]==0.0.37" && \
+    uv pip install --system --no-deps "copilotkit==0.1.93" && \
+    uv pip install --system "partialjson>=0.0.8,<0.0.9" "toml>=0.10.2,<0.11.0" && \
+    uv pip install --system \
+    "langchain==1.0.1" \
+    "langchain-openai>=1.1.0" \
+    "langchain-anthropic>=1.3.4" \
+    "langgraph==1.0.5" \
+    "langsmith>=0.4.49" \
+    "openai>=1.68.2,<2.0.0" \
+    "python-dotenv>=1.0.0,<2.0.0" \
+    "fastapi>=0.115.5,<1.0.0" \
+    "uvicorn>=0.29.0,<1.0.0"
+
+# serve.py adapts the original agent for Docker (no langgraph-cli needed)
+COPY serve.py ./
+
+# 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"]