feat(extraction): add Dockerfile + supervisord for extraction-service

- Multi-stage: Node.js build + Python sidecar + supervisord runtime
- Stage 1: pnpm workspace build for Fastify TS service
- Stage 2: pip install langextract + FastAPI deps
- Stage 3: node:22-alpine + python3 + supervisord
- supervisord manages both Fastify (4005) and uvicorn (4006)

services/extraction-service/Dockerfile

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+# Build context: repo root (docker compose sets context: .)
+# Multi-stage: Node.js build + Python sidecar + supervisord runtime
+
+# ── Stage 1: Node.js build ───────────────────────────────────────
+FROM node:22-alpine AS ts-builder
+RUN npm install -g pnpm@10
+WORKDIR /app
+
+# Copy workspace config + lockfile for dependency resolution
+COPY package.json pnpm-workspace.yaml pnpm-lock.yaml tsconfig.base.json ./
+
+# Copy all package.json files (pnpm needs these for workspace resolution)
+COPY packages/errors/package.json packages/errors/
+COPY packages/cosmos/package.json packages/cosmos/
+COPY packages/config/package.json packages/config/
+COPY packages/auth/package.json packages/auth/
+COPY packages/api-client/package.json packages/api-client/
+COPY packages/fastify-core/package.json packages/fastify-core/
+COPY packages/logger/package.json packages/logger/
+COPY packages/react-auth/package.json packages/react-auth/
+COPY packages/design-tokens/package.json packages/design-tokens/
+COPY packages/testing/package.json packages/testing/
+COPY packages/extraction/package.json packages/extraction/
+COPY services/extraction-service/package.json services/extraction-service/
+
+# Install all workspace deps
+RUN pnpm install --frozen-lockfile
+
+# Copy source
+COPY packages/ packages/
+COPY services/extraction-service/tsconfig.json services/extraction-service/
+COPY services/extraction-service/src/ services/extraction-service/src/
+
+# Build packages first, then service
+RUN pnpm -r --filter @lysnrai/extraction-service... build
+
+# Deploy to isolated directory (production deps only)
+RUN pnpm --filter @lysnrai/extraction-service deploy /app/deploy
+
+# ── Stage 2: Python sidecar build ────────────────────────────────
+FROM python:3.12-slim AS py-builder
+WORKDIR /sidecar
+
+COPY services/extraction-service/python/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY services/extraction-service/python/src/ src/
+
+# ── Stage 3: Production runtime ──────────────────────────────────
+FROM node:22-alpine
+RUN apk add --no-cache python3 py3-pip supervisor
+
+WORKDIR /app
+
+# Copy Node.js service
+COPY --from=ts-builder /app/deploy ./
+
+# Copy Python sidecar + installed packages
+COPY --from=py-builder /usr/local/lib/python3.12/site-packages /usr/lib/python3/dist-packages
+COPY --from=py-builder /usr/local/bin/uvicorn /usr/local/bin/uvicorn
+COPY --from=py-builder /sidecar/src /app/python/src
+
+# Copy supervisord config
+COPY services/extraction-service/supervisord.conf /etc/supervisor/conf.d/extraction.conf
+
+ENV NODE_ENV=production
+ENV PYTHON_SIDECAR_URL=http://localhost:4006
+
+EXPOSE 4005
+EXPOSE 4006
+
+CMD ["supervisord", "-c", "/etc/supervisor/conf.d/extraction.conf"]

services/extraction-service/supervisord.conf

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+[supervisord]
+nodaemon=true
+logfile=/dev/stdout
+logfile_maxbytes=0
+loglevel=info
+
+[program:fastify]
+command=node dist/server.js
+directory=/app
+autostart=true
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+environment=NODE_ENV="production",PORT="4005"
+
+[program:python-sidecar]
+command=uvicorn src.app:app --host 0.0.0.0 --port 4006 --workers 1
+directory=/app/python
+autostart=true
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+environment=PYTHONUNBUFFERED="1"