Update API_REFERENCE.md for the AI-Trader-Server rebrand:
- Change title from "AI-Trader API Reference" to "AI-Trader-Server API Reference"
- Update description to reference AI-Trader-Server
- Rename client class examples from AITraderClient to AITraderServerClient
- Update Python and TypeScript/JavaScript code examples
Part of Phase 1 rebrand (Task 3)
Reorganize documentation into user-focused, developer-focused, and deployment-focused sections.
**New structure:**
- Root: README.md (streamlined), QUICK_START.md, API_REFERENCE.md
- docs/user-guide/: configuration, API usage, integrations, troubleshooting
- docs/developer/: contributing, development setup, testing, architecture
- docs/deployment/: Docker deployment, production checklist, monitoring
- docs/reference/: environment variables, MCP tools, data formats
**Changes:**
- Streamline README.md from 831 to 469 lines
- Create QUICK_START.md for 5-minute onboarding
- Create API_REFERENCE.md as single source of truth for API
- Remove 9 outdated specification docs (v0.2.0 API design)
- Remove DOCKER_API.md (content consolidated into new structure)
- Remove docs/plans/ directory with old design documents
- Update CLAUDE.md with documentation structure guide
- Remove orchestration-specific references
**Benefits:**
- Clear entry points for different audiences
- No content duplication
- Better discoverability through logical hierarchy
- All content reflects current v0.3.0 API
