Add comprehensive roadmap document for optimizing the gns3/web-wireshark
Docker image size from current 2GB to target 1.5GB (25% reduction).
Key findings:
- 570MB of cleanable files identified (locales, docs, ibus, dev packages)
- Compression analysis shows limited benefit (1-5%) vs file cleanup (25%)
- Detailed implementation plan with safe optimization phases
- Focus on transfer optimization and build-time compression strategies
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
