Initial project setup with env template and gitignore

- .gitignore: Java/Maven, Node.js, IDE, OS, credentials
- .env.sample: backend + frontend environment variable template
- README.md: project overview and getting started guide
- CLAUDE.md: development rules and guidelines
- docs/: SUNDOL spec and design patterns guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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2026-03-30 06:37:07 +00:00
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