Integrate BACKBEAT SDK and resolve KACHING license validation

Major integrations and fixes:
- Added BACKBEAT SDK integration for P2P operation timing
- Implemented beat-aware status tracking for distributed operations
- Added Docker secrets support for secure license management
- Resolved KACHING license validation via HTTPS/TLS
- Updated docker-compose configuration for clean stack deployment
- Disabled rollback policies to prevent deployment failures
- Added license credential storage (CHORUS-DEV-MULTI-001)

Technical improvements:
- BACKBEAT P2P operation tracking with phase management
- Enhanced configuration system with file-based secrets
- Improved error handling for license validation
- Clean separation of KACHING and CHORUS deployment stacks

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docker/build.sh

@@ -22,9 +22,8 @@ echo "🚀 Quick Start:"
 echo "  1. Copy environment file:"
 echo "     cp docker/chorus.env.example docker/chorus.env"
 echo ""
-echo "  2. Edit docker/chorus.env with your license key:"
-echo "     CHORUS_LICENSE_EMAIL=your-email@example.com"
-echo "     CHORUS_LICENSE_KEY=your-license-key-here"
+echo "  2. Edit docker/chorus.env with your license ID:"
+echo "     CHORUS_LICENSE_ID=your-license-id-here"
 echo ""
 echo "  3. Start CHORUS:"
 echo "     docker-compose -f docker/docker-compose.yml --env-file docker/chorus.env up -d"