Add Docker support for watch command - fixes #5

[konard]

Summary

This PR adds Docker support to make the watch command fully containerizable for cloud development environments like GitHub Codespaces, GitPod, and other containerized setups.

What's Added

• Dockerfile: Node.js 18 Alpine-based container with proper security (non-root user)
• docker-compose.yml: Easy setup with volume mounts for Claude configuration files
• .env.example: Configuration template for environment variables
• Comprehensive Documentation: Added Docker installation and usage section to README
• Package Updates: Added Docker files to npm distribution, bumped version to 1.2.3

Key Features

• Volume Mounts: Automatically mounts ~/.claude/ directory and config files from host
• Watch Mode: Fully supports the --watch command in containerized environment
• Log Files: Watch mode logs are saved to ./logs/ directory
• Environment Variables: Easy configuration via .env file
• Signal Handling: Proper Ctrl+C handling for graceful shutdown
• Two Services: Main watcher service + CLI service for one-time operations

Usage Examples

# Quick start with docker-compose
docker-compose up --build

# One-time commands
docker-compose run --rm claude-profiles-cli node claude-profiles.mjs --store work

Test Plan

• Created and validated Dockerfile syntax
• Created and validated docker-compose.yml syntax
• Added comprehensive documentation with examples
• Updated package.json with new version and Docker files
• Verified all required volume mounts are present
• Confirmed proper environment variable handling

🤖 Generated with Claude Code

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Resolves #5