docs: add comprehensive backend documentation
- Add README.md with project overview, quick start, and API reference - Add CONTRIBUTING.md with development setup and contribution guidelines - Add docs/ARCHITECTURE.md with detailed system architecture diagrams - Add docs/API.md with complete API reference for LangGraph and Gateway - Add docs/README.md as documentation index - Update CLAUDE.md with improved structure and new features - Update docs/TODO.md to reflect current status - Update pyproject.toml description Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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hetaoBackend committed
4f4b7cde2e6efc5a2dc19227be0ec165eef0b1e7
Parent: 890a837