Add Dockerfile for one-command deployment

Dockerfile

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+# ═══════════════════════════════════════════════════════════
+# GraphRAG Inference Hackathon — Docker Deployment
+# ═══════════════════════════════════════════════════════════
+# Build:  docker build -t graphrag .
+# Run:    docker run -p 3000:3000 -e ANTHROPIC_API_KEY=sk-ant-... graphrag
+# ═══════════════════════════════════════════════════════════
+
+FROM node:20-slim AS frontend-builder
+
+WORKDIR /app/web
+COPY web/package.json web/package-lock.json* ./
+RUN npm install --frozen-lockfile 2>/dev/null || npm install
+COPY web/ ./
+RUN npm run build
+
+# ── Production Image ───────────────────────────────────
+FROM node:20-slim AS runner
+
+RUN apt-get update && apt-get install -y python3 python3-pip python3-venv && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Python backend
+COPY requirements.txt ./
+RUN python3 -m venv /app/venv && \
+    /app/venv/bin/pip install --no-cache-dir -r requirements.txt 2>/dev/null || true
+
+COPY graphrag/ ./graphrag/
+COPY openclaw/ ./openclaw/
+COPY tests/ ./tests/
+
+# Next.js frontend
+COPY --from=frontend-builder /app/web/.next ./web/.next
+COPY --from=frontend-builder /app/web/node_modules ./web/node_modules
+COPY --from=frontend-builder /app/web/package.json ./web/package.json
+COPY --from=frontend-builder /app/web/public ./web/public 2>/dev/null || true
+COPY web/src/ ./web/src/
+COPY web/next.config.ts ./web/
+
+# Environment
+ENV NODE_ENV=production
+ENV PATH="/app/venv/bin:$PATH"
+ENV HOSTNAME="0.0.0.0"
+
+EXPOSE 3000 7860
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+  CMD curl -f http://localhost:3000/ || exit 1
+
+# Default: run Next.js dashboard
+CMD ["sh", "-c", "cd /app/web && npm start -- -p 3000"]