feat: add GitHub Actions workflow for Docker image builds

- Created docker-build.yml workflow for automated Docker builds
- Configured GitHub Container Registry (ghcr.io) with GITHUB_TOKEN auth
- Added multi-architecture support (linux/amd64, linux/arm64)
- Integrated Trivy security scanning for vulnerability detection
- Implemented smart tagging based on branches, PRs, and releases
- Added build caching for improved performance
- Updated Dockerfiles with OCI labels for proper ghcr.io linking
- Created comprehensive README-DOCKER.md documentation

The workflow automatically builds and pushes images on:
- Push to main/develop branches
- Pull requests (build only, no push)
- Release publications
- Manual workflow dispatch

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude-flow/metrics/system-metrics.json

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