fix(prod): production startup fixes — health endpoint, serveStatic path, entrypoint, docker config
- Add /api/health endpoint for Docker healthchecks
- Fix serveStatic path: dist/public instead of ../public
- Fix entrypoint.sh: DB wait check, npx drizzle-kit migrate, add netcat
- Fix Dockerfile: add bash/netcat, fix COPY order, add tsconfig.node.json
- Fix docker-compose.yml: add OLLAMA/LLM env vars for Node.js fallback
- Fix docker-stack.yml: remove template vars, use env vars instead of secrets
- Fix drizzle.config.ts: add migrations prefix
- Update .env.example with full LLM provider documentation
322cebf475