```dockerfile
FROM node:20-alpine

WORKDIR /app

# Install dependencies first for better caching
COPY package.json package-lock.json* ./
RUN npm install --omit=dev

# Copy server files
COPY rosalinda-server/server.js ./
COPY rosalinda-server/server-ollama.js ./

# Create necessary directories
RUN mkdir -p /app/logs

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s \
  CMD wget -qO- http://localhost:3000/health || exit 1

# Start command with error handling
CMD ["node", "server.js"]
```