Add project documentation including:
- Feature overview (chat, tools, model management)
- Screenshots showcasing UI (dark/light mode, code generation, web search)
- Quick start with Docker Compose
- Installation instructions (Docker and manual)
- Configuration and environment variables
- Architecture overview and tech stack
- API reference and development guide
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
