Adds concurrently to start both the Vite frontend and Hono backend simultaneously in one terminal via the `bun run dev` command. Also updates documentation in README.md and CLAUDE.md to reflect the new development workflow.
Add project instructions for Claude Code, the initial database migration,
and ignore the .claude/ local config directory.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
