[WIP] Add multi-stage Dockerfile with build and runtime setup

[Copilot]

Plan for Multi-Stage Dockerfile

• Analyze project dependencies (ws and ajv are runtime dependencies, currently in devDependencies)
• Create multi-stage Dockerfile with:
  • Build stage: Install all dependencies, compile TypeScript to dist directory
  • Runtime stage: Copy only dist directory and install necessary runtime dependencies
• Configure Docker to:
  • Expose port 16666
  • Run node dist/main.js
  • Optimize for Docker layer caching (copy package files first, then install, then copy source)
• Test the Dockerfile builds successfully
• Verify the container runs correctly

Original prompt

Write a multi-stage Dockerfile for this project: first generate the dist directory in the build environment, then copy it to the /app directory of the runtime environment and run node main.js. Expose port 16666. Utilize the Docker image cache as much as possible.

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