docs: add product idea, design prototypes and development documentation
- IDEA.md: product vision from the user's perspective (input for design)
- Architecture, ADRs, data model, REST API overview
- Auth and roles, library storage (NFS, path regexes, scanner, search),
playback, recommendation system ("My Wave"), track upload queue
- Web, Android (offline, self-update), i18n, design system
- Testing strategy, Gitea Actions CI/CD, deployment, conventions, roadmap
- Clickable web/Android design prototypes and wave button variants
- .claude/launch.json to serve the prototypes locally
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
mrleo1nidandClaude Opus 5.5
9eb1c25147