feat: Complete dashboard integration and full system testing

✅ Frontend-Backend Integration
- Created API service layer (frontend/src/services/api.ts)
- Updated ChatInterface component to use real API endpoints
- Added project management (download, delete) functionality
- Implemented proper error handling and loading states

✅ FastAPI Backend Enhancements
- Fixed user_id field in project metadata
- Added comprehensive API endpoints for chat, generation, and projects
- Implemented WebSocket support for real-time chat
- Fixed project listing and download functionality

✅ Mock Mode Implementation
- Added intelligent mock responses for testing
- Smart parsing of BPM, genre, and key from user input
- Realistic project configurations based on user requests
- Works without API keys (currently enabled)

✅ System Testing
- Tested complete flow: chat → generation → download
- Verified ALS file generation and format
- Validated all API endpoints
- Created comprehensive TESTING_REPORT.md
- Created QUICK_START.md guide

✅ Bug Fixes
- Fixed BPM extraction regex in mock mode
- Fixed project metadata user_id inclusion
- Resolved TypeScript compilation errors
- Fixed import syntax for type-only imports

📊 Test Results:
- Chat API: ✅ Working (mock responses)
- Project Generation: ✅ Working (creates valid ALS)
- Download: ✅ Working (818 byte ALS files)
- Project Listing: ✅ Working (filters by user_id)
- ALS Files: ✅ Valid XML/gzip format

🔧 Current Status:
- MOCK_MODE=true (full functionality without API keys)
- GLM4.6: Insufficient balance
- Minimax M2: Endpoint 404
- Ready for production after API fixes

🤖 Features:
- Multi-genre support (House, Techno, Hip-Hop, etc.)
- Automatic BPM/key detection
- Complete Ableton Live project structure
- Project history and management

Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>

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